116 pubblicazioni classificate nel seguente modo:

Production of Composite Zinc Oxide–Polylactic Acid Radiopaque Filaments for Fused Deposition Modeling: First Stage of a Feasibility Study
MATERIALS
Autore/i: Cherubini, Francesca; Riberti, Nicole; Schiavone, ANNA MARIA; Davì, Fabrizio; Furlani, Michele; Giuliani, Alessandra; Barucca, Gianni; Cristina Cassani, Maria; Rinaldi, Daniele; Montalto, Luigi
Classificazione: 1 Contributo su Rivista
Abstract: Three-dimensional printing technologies are becoming increasingly attractive for their versatility; the geometrical customizability and manageability of the final product properties are the key points. This work aims to assess the feasibility of producing radiopaque filaments for fused deposition modeling (FDM), a 3D printing technology, starting with zinc oxide (ZnO) and polylactic acid (PLA) as the raw materials. Indeed, ZnO and PLA are promising materials due to their non-toxic and biocompatible nature. Pellets of PLA and ZnO in the form of nanoparticles were mixed together using ethanol; this homogenous mixture was processed by a commercial extruder, optimizing the process parameters for obtaining mechanically stable samples. Scanning electron microscopy analyses were used to assess, in the extruded samples, the homogenous distribution of the ZnO in the PLA matrix. Moreover, X-ray microtomography revealed a certain homogenous radiopacity; this imaging technique also confirmed the correct distribution of the ZnO in the PLA matrix. Thus, our tests showed that mechanically stable radiopaque filaments, ready for FDM systems, were obtained by homogenously loading the PLA with a maximum ZnO content of 6.5% wt. (nominal). This study produced multiple outcomes. We demonstrated the feasibility of producing radiopaque filaments for additive manufacturing using safe materials. Moreover, each phase of the process is cost-effective and green-oriented; in fact, the homogenous mixture of PLA and ZnO requires only a small amount of ethanol, which evaporates in minutes without any temperature adjustment. Finally, both the extruding and the FDM technologies are the most accessible systems for the additive manufacturing commercial apparatuses.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/331752

Theoretical Basis for the Photoelastic Residual Stress Evaluation in Misaligned Cubic Crystals
CRYSTALS
Autore/i: Davi', Fabrizio; Rinaldi, Daniele; Montalto, L.
Classificazione: 1 Contributo su Rivista
Abstract: Photoelasticity is a fast and powerful technique for internal stress detection and quality control in crystals; to fully exploit its possibilities, an appropriate theoretical analysis must be devel- oped for different crystallographic structure and observation planes. For a cubic crystal specimen whose geometry is non-coherent with its crystallographic directions (i.e., observation planes and crystallographic directions are not parallel), we write a set of equations that allow an estimate of the refraction indices as a function of the residual stress. This is obtained upon the assumption that the residual stress may be represented by a plane stress parallel to the observation face. For cubic crystals, we obtain an explicit estimate of the residual stress intensity; this can be achieved provided we know the piezo-optic tensor component, the orientation of two non-parallel specimen faces with respect to the crystallographic axes, and that we can measure the principal directions of the refractive indices on the observation face.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/314511

A highly-compact and ultra-fast homogeneous electromagnetic calorimeter based on oriented lead tungstate crystals
FRONTIERS IN PHYSICS
Autore/i: Bandiera, L.; Baryshevsky, V. G.; Canale, N.; Carsi, S.; Cutini, S.; Davi', F.; De Salvador, D.; Gianoli, A.; Guidi, V.; Haurylavets, V.; Korjik, M.; Lobko, A. S.; Malagutti, L.; Mazzolari, A.; Montalto, L.; Guarnieri, P. Monti; Moulson, M.; Negrello, R.; Paternò, G.; Presti, M.; Rinaldi, D.; Romagnoni, M.; Selmi, A.; Sgarbossa, F.; Soldani, M.; Sytov, A.; Tikhomirov, V. V.; Vallazza, E.
Classificazione: 1 Contributo su Rivista
Abstract: Progress in high-energy physics has been closely tied to the development of high- performance electromagnetic calorimeters. Recent experiments have demonstrated the possibility to significantly accelerate the development of electromagnetic showers inside scintillating crystals typically used in homogeneous calorimeters based on scintillating crystals when the incident beam is aligned with a crystallographic axis to within a few mrad. In particular, a reduction of the radiation length has been measured when ultrarelativistic electron and photon beams were incident on a high-Z scintillator crystal along one of its main axes. Here, we propose the possibility to exploit this physical effect for the design of a new type of compact e.m. calorimeter, based on oriented ultra- fast lead tungstate (PWO-UF) crystals, with a significant reduction in the depth needed to contain electromagnetic showers produced by high-energy particles with respect to the state-of-the-art. We report results from tests of the crystallographic quality of PWO-UF samples via high-resolution X-ray diffraction and photoelastic analysis. We then describe a proof-of-concept calorimeter geometry defined with a Geant4 model including the shower development in oriented crystals. Finally, we discuss the experimental techniques needed for the realization of a matrix of scintillator crystals oriented along a specific crystallographic direction. Since the angular acceptance for e.m. shower acceleration depends little on the particle energy, while the decrease of the shower length remains pronounced at very high energy, an oriented crystal calorimeter will open the way for applications at the maximum energies achievable in current and future experiments. Such applications span from forward calorimeters, to compact beam dumps for the search for light dark matter, to source-pointing space-borne γ-ray telescopes, to decrease the size and the cost of the calorimeter needed to fully contain e.m. showers initiated by GeV to TeV particles.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/323911

PbWO$_4$ Acoustic Properties Measurement by Laser Ultrasonics with the Aim of Optical Damage Recovery
CRYSTALS
Autore/i: Davi', F.; Paone, N.; Rinaldi, D.; Montalto, L.; Dormenev, V.
Classificazione: 1 Contributo su Rivista
Abstract: The paper, at first, discusses theoretical aspects of acoustic wave propagation in lead tungstate (PWO). After that, it introduces the application of laser ultrasonics to PWO crystals with the aim of measuring the acoustic properties and the absorbed energy. A specific set-up has been developed to deposit energy in the crystals by means of shock waves generated by a pulsed Nd-YAG laser. We measured the acoustic properties of the PWO crystals along the crystallographic c axis and measured the acoustic energy absorption. Calculations confirmed that the majority of the energy has been absorbed in the samples. Since in scintillating crystals the radiation damage leads to a decrease in the optical transmission, the paper formulates the hypothesis that the laser energy absorbed can sustain recovery of the optical transmittance properties. Preliminary tests of light transmittance measurements showed a systematic improvement of optical transmittance after laser treatment in a series of PWO samples. These results are consistent and in agreement with the hypothesis, and they support the feasibility of a laser-based method to recover radiation-damaged crystals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/312718

A CIRCULARLY POLARIZED MEASUREMENT VISION SYSTEM FOR ATTENUATION OF REFLECTION AND GLARE
Proceedings del VI Forum Nazionale delle Misure
Autore/i: Montalto, L.; Castellini, P.; Rinaldi, D.; Paone, N.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/309545

Optimization of the photoelastic conoscopic fringe pattern processing for the stress measurement on uniaxial PWO crystal cut parallel to the a-c plane and with variable thickness.
JOURNAL OF INSTRUMENTATION
Autore/i: Natali, P. P.; Cherubini, Francesca; Davi, Fabrizio; Montalto, L.; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: This paper presents a case study in which conoscopic, non-invasive, photoelastic techniques and the associated model are applied for the first time to investigate the internal stress state of the PbWO4 (PWO) uniaxial crystal, cut normal to the crystallographic a-c plane and with non-uniform thickness. As a matter of facts indeed, in the mass production of crystals it is rather probable to have specimen of non-constant thickness. In addition, the crystal cut, normal to the a-c plane, lead to a complex fringes structure and modeling. This can affect the fringe patterns interpretation, and in turn the interpretation of the stress state within the sample. In this paper we analyze the dependence of some model parameters on the thickness, and the relative interpretation of the fringe pattern in order to obtain a reliable measure of the stress for observations normal to the a-c plane. This procedure can speed up the crystal analysis whatever the thickness of the crystal is.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/294521

Luminescence and Structural Characterization of Gd2O2S Scintillators Doped with Tb3+, Ce3+, Pr3+ and F for Imaging Applications
CRYSTALS
Autore/i: De Martinis, Alessia; Montalto, Luigi; Scalise, Lorenzo; Rinaldi, Daniele; Mengucci, Paolo; Michail, Christos; Fountos, George; Martini, Nicki; Koukou, Vaia; Valais, Ioannis; Bakas, Athanasios; Fountzoula, Christine; Kandarakis, Ioannis; David, Stratos
Classificazione: 1 Contributo su Rivista
Abstract: Radiodiagnostic technologies are powerful tools for preventing diseases and monitoring the condition of patients. Medicine and sectors such as industry and research all use this inspection methodology. This field demands innovative and more sophisticated systems and materials for improving resolution and sensitivity, leading to a faster, reliable, and safe diagnosis. In this study, a large characterization of gadolinium oxysulfide (Gd2O2S) scintillator screens for imaging applications has been carried out. Seven scintillator samples were doped with praseodymium (Pr3+), terbium (Tb3+) activators and co-doped with praseodymium, cerium, and fluorine (Gd2O2S:Pr,Ce,F). The sample screens were prepared in the laboratory in the form of high packing density screens, following the methodology used in screen sample preparation in infrared spectroscopy and luminescence. Parameters such as quantum detection efficiency (QDE), energy absorption efficiency (EAE), and absolute luminescence efficiency (ALE) were evaluated. In parallel, a structural characterization was performed, via XRD and SEM analysis, for quality control purposes as well as for correlation with optical properties. Spatial resolution properties were experimentally evaluated via the Modulation Transfer Function. Results were compared with published data about Gd2O2S:Pr,Ce,F screens produced with a standard method of a sedimentation technique. In particular, the ALE rose with the X-ray tube voltage up to 100 kVp, while among the different dopants, Gd2O2S:Pr exhibited the highest ALE value. When comparing screens with different thicknesses, a linear trend for the ALE value was not observed; the highest ALE value was measured for the 0.57 mm thick Gd2O2S:Pr,Ce,F sample, while the best MTF values were found in the thinner Gd2O2S:Pr,Ce,F screen with 0.38 mm thickness.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/303799

New opportunities in the design of gamma-camera collimators for medical imaging
2021 IEEE Sensors Applications Symposium, SAS 2021 - Proceedings
Autore/i: Verdenelli, L.; Montalto, L.; Scalise, L.; David, S.; Loudos, G.; Rinaldi, D.; Paone, N.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In nuclear medicine, the gamma camera is one of the more used imaging devices for radionuclide imaging. Gamma camera provide an image of the target organ, with high spatial resolution and sensitivity; gamma cameras use collimators. This paper presents a simple and customizable collimator to be used in radionuclide imaging for preclinical studies, using additive manufacturing (AM) techniques. A numerical analysis, based on GATE Monte Carlo toolkit (vGate 8.2), has been conducted to simulate different configurations of an already working collimator used as reference. In addition to the standard collimator geometry with alternatives materials, we also propose a new concept of collimator to be easily 3D printed, using different 3D printing technologies. We have simulated collimators with square apertures of 1.5 mm and septa of 0.4 mm of thickness, source was Tc99m. The materials simulated were standard tungsten, a PLA doped with tungsten (Rapid 3DShield Tungsten Filament – Virtual Foundry), a classical PLA filament and PA2200 for the new concept. The results show a similar behavior for what concern the spatial resolution, while for the sensitivity a reduction of about 45% of entries is reported. This is due mainly since the extruded pixel, made of PLA or PA2200, have higher density (≈ 1.24 g/cm^3 for PLA and ≈ 0,95 g/cm^3 for PA2200) with respect to air (≈ 0,0012 g/cm^3). Further studies are necessary to explore optimization of the used design to reduce the impact of material density.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/295723

The Refraction Indices and Brewster Law in Stressed Isotropic Materials and Cubic Crystals
CRYSTALS
Autore/i: Rinaldi, Daniele; Natali, PIER PAOLO; Montalto, Luigi; Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: We study the elasto-optic behavior of stressed cubic crystals (all classes) and isotropic materials (like e.g. glasses). We obtain the explicit dependence of the refraction indices on the stress (either applied or residual), as well as a mild generalization of the Brewster law for cubic crystals. We show also that the optic indicatrix and the stress ellipsoid are coaxial only in the isotropic case. This theory allows the improvement of the measurements techniques, as photoelasticity, on cubic crystals and optically isotropic materials.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/291735

PANDA Phase one
EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G.; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Krusche, B.; Steinacher, M.; Liu, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Coen, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.; Fritsch, M.; Grochowski, J.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kümmel, M.; Ner, M. Kü.; Li, J.; Linzen, L.; Maldaner, S.; Oppotsch, J.; Pankonin, S.; Pelizäus, M.; Pflüger, S.; Reher, J.; Reicherz, G.; Schnier, C.; Steinke, M.; Triffterer, T.; Wenzel, C.; Wiedner, U.; Denizli, H.; Er, N.; Keskin, U.; Yerlikaya, S.; Yilmaz, A.; Beck, R.; Chauhan, V.; Hammann, C.; Hartmann, J.; Ketzer, B.; Müllers, J.; Salisbury, B.; Schmidt, C.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Rimjaem, S.; Domagala, M.; Filo, G.; Lisowski, E.; Lisowski, F.; Michałek, M.; Pozna´ nski, P.; Płazek, J.; Korcyl, K.; Lebiedowicz, P.; Pysz, K.; Schäfer, W.; Szczurek, A.; Firlej, M.; Fiutowski, T.; Idzik, M.; Moron, J.; Swientek, K.; Terlecki, P.; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Jiang, P.; Karabowicz, R.; Koch, S.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Orth, H.; Peters, K.; Pütz, J.; Ritman, J.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V.; Alexeev, G.; Barabanov, M. Yu.; Dodokhov, V. Kh.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Yu.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Watts, D.; Böhm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Seth, K.; Xiao, T.; Ali, A.; Hamdi, A.; Himmelreich, M.; Krebs, M.; Nakhoul, S.; Nerling, F.; Gianotti, P.; Lucherini, V.; Bracco, G.; Bodenschatz, S.; Brinkmann, K. T.; Brück, L.; Diehl, S.; Dormenev, V.; Düren, M.; Erlen, T.; Hahn, C.; Hayrapetyan, A.; Hofmann, J.; Kegel, S.; Khalid, F.; Köseoglu, I.; Kripko, A.; Kühn, W.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Orsich, P.; Pereira-de-Lira, J.; Sachs, M.; Schmidt, M.; Schubert, R.; Strickert, M.; Wasem, T.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.; Ireland, D.; Seitz, B.; Kappert, R.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; A, ; Rodin, V.; Kalita, K.; Huang, G.; Liu, D.; Peng, H.; Qi, H.; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Derichs, A.; Dosdall, R.; Esmail, W.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kannika, J.; Kulessa, P.; Orfanitski, S.; Perez-Andrade, G.; Prasuhn, D.; Prencipe, E.; Rosenthal, E.; Schadmand, S.; Schmitz, R.; Scholl, A.; Sefzick, T.; Serdyuk, V.; Stockmanns, T.; Veretennikov, D.; Wintz, P.; Wüstner, P.; Xu, H.; Zhou, Y.; Cao, X.; Hu, Q.; Liang, Y.; Rigato, V.; Isaksson, L.; Achenbach, P.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Leithoff, H. H.; Merkel, H.; Müller, U.; Petersen, J.; Pochodzalla, J.; Schlimme, S.; Sfienti, C.; Thiel, M.; Bleser, S.; Bölting, M.; Capozza, L.; Dbeyssi, A.; Ehret, A.; Klasen, R.; Kliemt, R.; Maas, F.; Motzko, C.; Noll, O.; Rodríguez Piñeiro, D.; Schupp, F.; Steinen, M.; Wolff, S.; Zimmermann, I.; Kazlou, D.; Korzhik, M.; Missevitch, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Golubev, A.; Kantsyrev, A.; Kirin, D. Y.; Kristi, N.; Ladygina, E.; Luschevskaya, E.; Matveev, V. A.; Panjushkin, V.; Stavinskiy, A. V.; Balashoff, A.; Boukharov, A.; Bukharova, M.; Malyshev, O.; Vishnevsky, E.; Bonaventura, D.; Brand, P.; Hetz, B.; Hüsken, N.; Kellers, J.; Khoukaz, A.; Klostermann, D.; Mannweiler, C.; Vestrick, S.; Bumrungkoh, D.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Manasatitpong, K.; Nasawad, T.; Pongampai, S.; Simantathammakul, T.; Srisawad, P.; Wongprachanukul, N.; Yan, Y.; Yu, C.; Zhang, X.; Zhu, W.; Antokhin, E.; Barnyakov, A. Yu.; Beloborodov, K.; Blinov, V. E.; Kuyanov, I. A.; Pivovarov, S.; Pyata, E.; Tikhonov, Y.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Lattery, M.; Boca, G.; Duda, D.; Finger, M.; Finger Jr., M.; Kveton, A.; Prochazka, I.; Slunecka, M.; Volf, M.; Jary, V.; Korchak, O.; Marcisovsky, M.; Neue, G.; Novy, J.; Tomasek, L.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A.; Ferapontov, V.; Goncharenko, Y.; Levin, A.; Maslova, E.; Melnik, Y.; Meschanin, A.; Minaev, N.; Mochalov, V.; Moiseev, V.; Morozov, D.; Nogach, L.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P.; Shein, I.; Uzunian, A.; Vasiliev, A.; Yakutin, A.; Belostotski, S.; Fedotov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O.; Cederwall, B.; Preston, M.; Tegner, P. E.; Wölbing, D.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.; Dobbs, S.; Eugenio, P.; Bussa, M. P.; Spataro, S.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Wheadon, R.; Iazzi, F.; Lavagno, A.; Akram, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Regina, J.; Rieger, J.; Schönning, K.; Wolke, M.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Tarasiuk, J.; Wojciechowski, M.; Wronka, S.; Zwieglinski, B.; Amsler, C.; Bühler, P.; Marton, J.; Zimmermann, S.; Fischer, C. S.; Haidenbauer, J.; Hanhart, C.; Lutz, M. F. M.; Ryan, Sinéad M.
Classificazione: 1 Contributo su Rivista
Abstract: The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or PANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the nonperturbative regime remains one of the greatest challenges in contemporary physics. The antiproton–nucleon interaction studied with PANDA provides crucial tests in this area. Furthermore, the high-intensity, low-energy domain of PANDA allows for searches for physics beyond the Standard Model, e.g. through high precision symmetry tests. This paper takes into account a staged approach for the detector setup and for the delivered luminosity from the accelerator. The available detector setup at the time of the delivery of the first antiproton beams in the HESR storage ring is referred to as the Phase One setup. The physics programme that is achievable during Phase One is outlined in this paper.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290677

Study of excited Ξ baryons with the PANDA detector
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G.; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Krusche, B.; Steinacher, M.; Li, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Coen, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.; Fritsch, M.; Grochowski, J.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kümmel, M.; Küner, M.; Li, J.; Linzen, L.; Maldaner, S.; Oppotsch, J.; Pankonin, S.; Pelizä, M.; Pflüger, S.; Reher, J.; Reicherz, G.; Schnier, C.; Steinke, M.; Triffterer, T.; Wenzel, C.; Wiedner, U.; Denizli, H.; Er, N.; Keskin, U.; Yerlikaya, S.; Yilmaz, A.; Bec, R.; Chauhan, V.; Hammann, C.; Hartmann, J.; Ketzer, B.; Müllers, J.; Salisbury, B.; Schmidt, C.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Domagala, M.; Filo, G.; Lisowski, E.; Lisowski, F.; Michałek, M.; Poznanski, P.; Płazek, J.; Korcyl, K.; Lebiedowicz, P.; Pysz, K.; Schäfer, W.; Szczurek, A.; Firlej, M.; Fiutowski, T.; Idzik, M.; Moron, J.; Swientek, K.; Terlecki, P.; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Jiang, P.; Karabowicz, R.; Koch, S.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Orth, H.; Peters, K.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V.; Alexeev, G.; Barabanov, M. Yu.; Dodokhov, V. Kh.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Yu.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Watts, D.; Böhm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Seth, K.; Xiao, T.; Ali, A.; Hamdi, A.; Himmelreich, M.; Krebs, M.; Nakhoul, S.; Nerling, F.; Gianotti, P.; Lucherini, V.; Bracco, G.; Bodenschatz, S.; Brinkmann, K. T.; Brück, L.; Diehl, S.; Dormenev, V.; Düren, M.; Erlen, T.; Hahn, C.; Hayrapetyan, A.; Hofmann, J.; Kegel, S.; Khalid, F.; Köseoglu, I.; Kripko, A.; Kühn, W.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Orsich, P.; Pereira-de-Lira, J.; Sachs, M.; Schmidt, M.; Schubert, R.; Strickert, M.; Wasem, T.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.; Ireland, D.; Seitz, B.; Kappert, R.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; Rodin, V.; Kalita, K.; Huang, G.; Liu, D.; Peng, H.; Qi, H.; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Derichs, A.; Dosdall, R.; Esmail, W.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kannika, J.; Kulessa, P.; Orfanitski, S.; Pérez-Andrade, G.; Prasuhn, D.; Prencipe, E.; Pütz, J.; Ritman, J.; Rosenthal, E.; Schadmand, S.; Schmitz, R.; Scholl, A.; Sefzick, T.; Serdyuk, V.; Stockmanns, T.; Veretennikov, D.; Wintz, P.; Wüstner, P.; Xu, H.; Zhou, Y.; Cao, X.; Hu, Q.; Liang, Y.; Rigato, V.; Isaksson, L.; Achenbach, P.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Leithoff, H. H.; Merkel, H.; Müller, U.; Petersen, J.; Pochodzalla, J.; Schlimme, S.; Sfienti, C.; Thiel, M.; Bleser, S.; Bölting, M.; Capozza, L.; Dbeyssi, A.; Ehret, A.; Klasen, R.; Kliemt, R.; Maas, F.; Motzko, C.; Noll, O.; Rodríguez Piñeiro, D.; Schupp, F.; Steinen, M.; Wolff, S.; Zimmermann, I.; Kazlou, D.; Korzhik, M.; Missevitch, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Golubev, A.; Kantsyrev, A.; Kirin, D. Y.; Kristi, N.; Ladygina, E.; Luschevskaya, E.; Matveev, V. A.; Panjushkin, V.; Stavinskiy, A. V.; Balashoff, A.; Boukharov, A.; Bukharova, M.; Malyshev, O.; Vishnevsky, E.; Bonaventura, D.; Brand, P.; Hetz, B.; Hüsken, N.; Kellers, J.; Khoukaz, A.; Klostermann, D.; Mannweiler, C.; Vestrick, S.; Bumrungkoh, D.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Manasatitpong, K.; Nasawad, T.; Pongampai, S.; Simantathammakul, T.; Srisawad, P.; Wongprachanukul, N.; Yan, Y.; Yu, C.; Zhang, X.; Zhu, W.; Antokhin, E.; Barnyakov, A. Yu.; Beloborodov, K.; Blinov, V. E.; Kuyanov, I. A.; Pivovarov, S.; Pyata, E.; Tikhonov, Y.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Lattery, M.; Boca, G.; Duda, D.; Finger, M.; Finger Jr., M.; Kveton, A.; Pesek, M.; Peskova, M.; Prochazka, I.; Slunecka, M.; Volf, M.; Gallus, P.; Jary, V.; Korchak, O.; Marcisovsky, M.; Neue, G.; Novy, J.; Tomasek, L.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A.; Ferapontov, V.; Goncharenko, Y.; Levin, A.; Maslova, E.; Melnik, Y.; Meschanin, A.; Minaev, N.; Mochalov, V.; Moiseev, V.; Morozov, D.; Nogach, L.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P.; Shein, I.; Uzunian, A.; Vasiliev, A.; Yakutin, A.; Belostotski, S.; Fedotov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O.; Preston, M.; Tegner, P. E.; Wölbing, D.; Cederwall, B.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.; Dobbs, S.; Eugenio, P.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Wheadon, R.; Iazzi, F.; Lavagno, A.; Bussa, M. P.; Spataro, S.; Akram, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Regina, J.; Rieger, J.; Schönning, K.; Wolke, M.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Tarasiuk, J.; Wronka, S.; Zwieglinski, B.; Amsler, C.; Bühler, P.; Marton, J.; Zimmermann, S.
Classificazione: 1 Contributo su Rivista
Abstract: The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards N∗ and Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the N∗ and Δ spectra. The future antiproton experiment PANDA will provide direct access to final states containing a ΞΞ pair, for which production cross sections up to μb are expected in ¯pp reactions.With a luminosity of L = 1031 cm−2 s−1 in the first phase of the experiment, the expected cross sections correspond to a production rate of ∼ 106 events/day. With a nearly 4π detector acceptance, PANDA will thus be a hyperon factory. In this study, reactions of the type ¯pp → Ξ+Ξ∗− as well as ¯pp → Ξ∗+Ξ− with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between 3 and 5%. This allows high statistics data to be collected within a few weeks of data taking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/289859

Feasibility studies for the measurement of time-like proton electromagnetic form factors from ¯p p → μ+μ− at PANDA at FAIR
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, Gianni; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Erni, W.; Krusche, B.; Steinacher, M.; Walford, N.; Cao, N.; Liu, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Tao, J.; Xiong, X. A.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Coen, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.;   , ; M. Fritsch,   ; J. Grochowski,   ; R. Hagdorn,   ; F. H. Heinsius,   ; T. Held,   ; T. Holtmann,   ; I. Keshk,   ; H. Koch,   ; B. Kopf,   ; M. Kuhlmann,   ; M. Kümmel,   ; M. Küßner,   ; J. Li,   ; L. Linzen,   ; S. Maldaner,   ; J. Oppotsch,   ; S. Pankonin,   ; M. Pelizäus,   ; S. Pflüger,   ; A. Pitka,   ; J. Reher,   ; G. Reicherz,   ; C. Schnier,   ; M. Steinke,   ; T. Triffterer,   ; C. Wenzel,   ; Wiedner, U.; Denizli, H.;   , ; N. Er,   ; U. Keskin,   ; A. T. Olgun,   ; Yerlikaya, S.; Yilmaz, A.; Beck, R.;   , ; C. Hammann,   ; J. Hartmann,   ; B. Ketzer,   ; J. Müllers,   ; M. Rossbach,   ; B. Salisbury,   ; C. Schmidt,   ; U. Thoma,   ; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Domagala, M.;   , ; G. Filo,   ; E. Lisowski,   ; F. Lisowski,   ; M. Michałek,   ; Poznański, P.; Płażek, J.; Korcyl, K.;   , ; A. Kozela,   ; P. Lebiedowicz,   ; K. Pysz,   ; W. Schäfer,   ; Szczurek, A.; Firlej, M.;   , ; T. Fiutowski,   ; M. Idzik,   ; J. Moron,   ; Swientek, K.; Terlecki, P.; Korcyl, G.;   , ; R. Lalik,   ; A. Malige,   ; P. Moskal,   ; K. Nowakowski,   ; W. Przygoda,   ; N. Rathod,   ; Z. Rudy,   ; Salabura, P.; Smyrski, J.; Augustin, I.;   , ; R. Böhm,   ; I. Lehmann,   ; Schmitt, L.; Varentsov, V.; Al-Turany, M.;   , ; A. Belias,   ; H. Deppe,   ; R. Dzhygadlo,   ; H. Flemming,   ; A. Gerhardt,   ; K. Götzen,   ; A. Heinz,   ; P. Jiang,   ; R. Karabowicz,   ; S. Koch,   ; U. Kurilla,   ; D. Lehmann,   ; J. Lühning,   ; U. Lynen,   ; H. Orth,   ; K. Peters,   ; T. Saito,   ; G. Schepers,   ; C. J. Schmidt,   ; C. Schwarz,   ; J. Schwiening,   ; A. Täschner,   ; M. Traxler,   ; Voss, B.; Wieczorek, P.; Abazov, V.;   , ; G. Alexeev,   ; V. A. Arefiev,   ; V. Astakhov,   ; M. Yu. Barabanov,   ; B. V. Batyunya,   ; V. Kh. Dodokhov,   ; A. Efremov,   ; A. Fechtchenko,   ; A. Galoyan,   ; G. Golovanov,   ; E. K. Koshurnikov,   ; Y. Yu. Lobanov,   ; A. G. Olshevskiy,   ; A. A. Piskun,   ; A. Samartsev,   ; S. Shimanski,   ; N. B. Skachkov,   ; A. N. Skachkova,   ; E. A. Strokovsky,   ; V. Tokmenin,   ; V. Uzhinsky,   ; A. Verkheev,   ; Vodopianov, A.; Zhuravlev, N. I.; Branford, D.; Watts, D.; Böhm, M.;   , ; W. Eyrich,   ; A. Lehmann,   ; Miehling, D.; Pfaffinger, M.; Quin, N.;   , ; L. Robison,   ; Seth, K.; Xiao, T.; Bettoni, D.; Ali, A.;   , ; A. Hamdi,   ; M. Himmelreich,   ; M. Krebs,   ; Nakhoul, S.; Nerling, F.; Belousov, A.;   , ; I. Kisel,   ; G. Kozlov,   ; Pugach, M.; Zyzak, M.; Bianchi, N.;   , ; Gianotti, P.; Lucherini, V.; Bracco, G.; Bettner, Y.;   , ; S. Bodenschatz,   ; K. T. Brinkmann,   ; L. Brück,   ; S. Diehl,   ; V. Dormenev,   ; M. Düren,   ; T. Erlen,   ; K. Föhl,   ; C. Hahn,   ; A. Hayrapetyan,   ; J. Hofmann,   ; S. Kegel,   ; M. Kesselkaul,   ; I. Köseoglu,   ; A. Kripko,   ; W. Kühn,   ; J. S. Lange,   ; V. Metag,   ; M. Moritz,   ; M. Nanova,   ; R. Novotny,   ; P. Orsich,   ; J. Pereira-de-Lira,   ; M. Peter,   ; M. Sachs,   ; M. Schmidt,   ; R. Schubert,   ; H. Stenzel,   ; M. Straube,   ; M. Strickert,   ; U. Thöring,   ; T. Wasem,   ; Wohlfahrt, B.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.;   , ; Ireland, D.; Seitz, B.; Deepak, P. N.; Kulkarni, A.; Kappert, R.;   , ; M. Kavatsyuk,   ; H. Loehner,   ; J. Messchendorp,   ; V. Rodin,   ; Schakel, P.; Vejdani, S.; Dutta, K.; Kalita, K.; Huang, G.;   , ; D. Liu,   ; H. Peng,   ; H. Qi,   ; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Tavukoglu, Z.; Derichs, A.;   , ; R. Dosdall,   ; W. Esmail,   ; A. Gillitzer,   ; F. Goldenbaum,   ; D. Grunwald,   ; L. Jokhovets,   ; J. Kannika,   ; P. Kulessa,   ; S. Orfanitski,   ; G. Pérez Andrade,   ; D. Prasuhn,   ; E. Prencipe,   ; J. Pütz,   ; J. Ritman,   ; E. Rosenthal,   ; S. Schadmand,   ; R. Schmitz,   ; A. Scholl,   ; T. Sefzick,   ; V. Serdyuk,   ; T. Stockmanns,   ; D. Veretennikov,   ; P. Wintz,   ; P. Wüstner,   ; Xu, H.; Zhou, Y.; Cao, X.;   , ; Q. Hu,   ; Z. Li,   ; H. Li,   ; Liang, Y.; Ma, X.; Rigato, V.; Isaksson, L.; Achenbach, P.;   , ; O. Corell,   ; A. Denig,   ; M. Distler,   ; M. Hoek,   ; W. Lauth,   ; H. H. Leithoff,   ; Z. Liu,   ; H. Merkel,   ; U. Müller,   ; J. Pochodzalla,   ; S. Schlimme,   ; C. Sfienti,   ; Thiel, M.; Zambrana, M.; Ahmed, S.;   , ; S. Bleser,   ; M. Bölting,   ; L. Capozza,   ; A. Dbeyssi,   ; A. Ehret,   ; R. Klasen,   ; R. Kliemt,   ; F. Maas,   ; C. Motzko,   ; O. Noll,   ; D. Rodríguez Piñeiro,   ; F. Schupp,   ; M. Steinen,   ; Wolff, S.; Zimmermann, I.; Fedorov, A.;   , ; D. Kazlou,   ; Korzhik, M.; Missevitch, O.; Balanutsa, P.;   , ; V. Chernetsky,   ; A. Demekhin,   ; A. Dolgolenko,   ; P. Fedorets,   ; A. Gerasimov,   ; A. Golubev,   ; V. Goryachev,   ; A. Kantsyrev,   ; D. Y. Kirin,   ; N. Kristi,   ; E. Ladygina,   ; E. Luschevskaya,   ; V. A. Matveev,   ; Panjushkin, V.; Stavinskiy, A. V.; Balashoff, A.;   , ; Boukharov, A.; Malyshev, O.; Basant, K. N.;   , ; H. Kumawat,   ; B. Roy,   ; Saxena, A.; Yogesh, S.; Bonaventura, D.;   , ; P. Brand,   ; C. Fritzsch,   ; S. Grieser,   ; C. Hargens,   ; A. K. Hergemöller,   ; B. Hetz,   ; N. Hüsken,   ; J. Kellers,   ; A. Khoukaz,   ; Mannweiler, C.; Vestrick, S.; Bumrungkoh, D.;   , ; C. Herold,   ; K. Khosonthongkee,   ; C. Kobdaj,   ; A. Limphirat,   ; K. Manasatitpong,   ; T. Nasawad,   ; S. Pongampai,   ; T. Simantathammakul,   ; P. Srisawad,   ; Wongprachanukul, N.; Yan, Y.; Yu, C.;   , ; Zhang, X.; Zhu, W.; Blinov, A. E.;   , ; Kononov, S.; Kravchenko, E. A.; Antokhin, E.;   , ; A. Yu. Barnyakov,   ; K. Beloborodov,   ; V. E. Blinov,   ; I. A. Kuyanov,   ; S. Pivovarov,   ; Pyata, E.; Tikhonov, Y.; Hunter, G.;   , ; Lattery, M.; Pace, H.; Boca, G.; Duda, D.; Finger, M.;   , ; Finger, M.;   , Jr.; A. Kveton,   ; M. Pesek,   ; M. Peskova,   ; I. Prochazka,   ; Slunecka, M.; Volf, M.; Gallus, P.;   , ; V. Jary,   ; O. Korchak,   ; M. Marcisovsky,   ; G. Neue,   ; J. Novy,   ; L. Tomasek,   ; M. Tomasek,   ; Virius, M.; Vrba, V.; Abramov, V.;   , ; S. Bukreeva,   ; S. Chernichenko,   ; A. Derevschikov,   ; V. Ferapontov,   ; Y. Goncharenko,   ; A. Levin,   ; E. Maslova,   ; Y. Melnik,   ; A. Meschanin,   ; N. Minaev,   ; V. Mochalov,   ; V. Moiseev,   ; D. Morozov,   ; L. Nogach,   ; S. Poslavskiy,   ; A. Ryazantsev,   ; S. Ryzhikov,   ; P. Semenov,   ; I. Shein,   ; A. Uzunian,   ; Vasiliev, A.; Yakutin, A.; Roy, U.; Yabsley, B.; Belostotski, S.;   , ; G. Fedotov,   ; G. Gavrilov,   ; A. Izotov,   ; S. Manaenkov,   ; Miklukho, O.; Zhdanov, A.; Atac, A.;   , ; Bäck, T.; Cederwall, B.; Makonyi, K.;   , ; M. Preston,   ; Tegner, P. E.; Wölbing, D.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.;   , ; S. Dobbs,   ; Eugenio, P.; Lersch, D.; Calvo, D.;   , ; P. De Remigis,   ; A. Filippi,   ; G. Mazza,   ; Rivetti, A.; Wheadon, R.; Bussa, M. P.; Spataro, S.; Iazzi, F.; Lavagno, A.; Martin, A.; Akram, A.;   , ; H. Calen,   ; W. Ikegami Andersson,   ; T. Johansson,   ; A. Kupsc,   ; P. Marciniewski,   ; M. Papenbrock,   ; J. Regina,   ; J. Rieger,   ; Schönning, K.; Wolke, M.; Pothodi Chackara, V.; Chlopik, A.;   , ; G. Kesik,   ; D. Melnychuk,   ; J. Tarasiuk,   ; M. Wojciechowski,   ; Wronka, S.; Zwieglinski, B.; Amsler, C.;   , ; P. Bühler,   ; J. Marton,   ; W. Nalti,   ; D. Steinschaden,   ; E. Widmann,   ; S. Zimmermann, J. Zmeskal
Classificazione: 1 Contributo su Rivista
Abstract: This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, || | G E | and || | G M | , using the ¯→+− p ¯ p → μ + μ − reaction at P⎯⎯⎯ANDA P ¯ ANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at P⎯⎯⎯ANDA P ¯ ANDA , using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is ¯→+− p ¯ p → π + π − , due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/286840

Elasto-optic properties and internal stress analysis for monoclinic and trigonal crystals
JOURNAL OF INSTRUMENTATION
Autore/i: Rinaldi, D.; Montalto, L.; Natali, P. P.; Davi', F.
Classificazione: 1 Contributo su Rivista
Abstract: We study the elasto-optic behaviour of monoclinic and trigonal crystals. The eigenvalues and eigenvectors of the dielectric impermeability tensor under stress are evaluated by the means of the approximated formulae obtained by Sirotin. The parameters which characterize Bertin’s surfaces and fringe patterns in conoscopic observation are determined as functions of either residual or applied stress. Later, the photoelastic constants, and the rotation of the optic plane and optic axes bisector are estimated in order to allow for the evaluation of the residual or applied stress by conoscopic measurements. Finally, we obtain the dependence of the refraction indices on the stress. The knowledge of these crystal properties is mandatory for applications in high physics energy, security, geological prospection and in crystals for photonics and medical applications. The evaluated photoelastic constants allow the development of methodologies for an easy and fast quality control via stress distribution detections by means of conoscopic observation, even for strongly anisotropic crystals. As a case study we apply these results to the cases of monoclinic LYSO and trigonal Lithium Niobate.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/291500

The potential of $Lambda$ and $Chi^{-}$ studies with PANDA at FAIR
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G.; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Erni, W.; Krusche, B.; Steinacher, M.; Walford, N.; Cao, N.; Liu, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Tao, J.; Xiong, X. A.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.; Fritsch, M.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kuhlmann, M.; Kümmel, M.; Küßner, M.; Li, J.; Mustafa, A.; Pelizäus, M.; Pitka, A.; Reher, J.; Reicherz, G.; Richter, M.; Schnier, C.; Sohl, L.; Steinke, M.; Triffterer, T.; Wenzel, C.; Wiedner, U.; Denizli, H.; Er, N.; Beck, R.; Hammann, C.; Hartmann, J.; Ketzer, B.; Müllers, J.; Rossbach, M.; Salisbury, B.; Schmidt, C.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Domagala, M.; Filo, G.; Lisowski, E.; Lisowski, F.; Michałek, M.; Poznański, P.; Płażek, J.; Korcyl, K.; Kozela, A.; Lebiedowicz, P.; Pysz, K.; Schäfer, W.; Szczurek, A.; Fiutowski, T.; Idzik, M.; Swientek, K.; Terlecki, P.; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Rudy, Z.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Jiang, P.; Karabowicz, R.; Koch, S.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Orth, H.; Peters, K.; Rieger, J.; Saito, T.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V.; Alexeev, G.; Arefiev, V. A.; Astakhov, V.; Barabanov, M. Yu.; Batyunya, B. V.; Dodokhov, V. Kh.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Yu.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Branford, D.; Watts, D.; Böhm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Quin, N.; Robison, L.; Seth, K.; Xiao, T.; Bettoni, D.; Ali, A.; Hamdi, A.; Himmelreich, M.; Krebs, M.; Nakhoul, S.; Nerling, F.; Belousov, A.; Kisel, I.; Kozlov, G.; Pugach, M.; Zyzak, M.; Bianchi, N.; Gianotti, P.; Lucherini, V.; Bracco, G.; Bettner, Y.; Bodenschatz, S.; Brinkmann, K. T.; Brück, L.; Diehl, S.; Dormenev, V.; Düren, M.; Erlen, T.; Föhl, K.; Hahn, C.; Hayrapetyan, A.; Hofmann, J.; Kegel, S.; Kesselkaul, M.; Köseoglu, I.; Kripko, A.; Kühn, W.; Lange, J. S.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Orsich, P.; Pereira-de-Lira, J.; Peter, M.; Sachs, M.; Schmidt, M.; Schubert, R.; Stenzel, H.; Straube, M.; Strickert, M.; Thöring, U.; Wasem, T.; Wohlfahrt, B.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.; Ireland, D.; Seitz, B.; Deepak, P. N.; Kulkarni, A.; Kappert, R.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; Rodin, V.; Schakel, P.; Vejdani, S.; Dutta, K.; Kalita, K.; Huang, G.; Liu, D.; Peng, H.; Qi, H.; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Derichs, A.; Dosdall, R.; Esmail, W.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kannika, J.; Kulessa, P.; Orfanitski, S.; Pérez Andrade, G.; Prasuhn, D.; Prencipe, E.; Pütz, J.; Ritman, J.; Rosenthal, E.; Schadmand, S.; Schmitz, R.; Scholl, A.; Sefzick, T.; Serdyuk, V.; Stockmanns, T.; Veretennikov, D.; Wintz, P.; Wüstner, P.; Xu, H.; Zhou, Y.; Cao, X.; Hu, Q.; Li, Z.; Li, H.; Liang, Y.; Ma, X.; Rigato, V.; Isaksson, L.; Achenbach, P.; Aycock, A.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Leithoff, H. H.; Liu, Z.; Merkel, H.; Müller, U.; Pochodzalla, J.; Schlimme, S.; Sfienti, C.; Thiel, M.; Zambrana, M.; Ahmed, S.; Bleser, S.; Bölting, M.; Capozza, L.; Dbeyssi, A.; Ehret, A.; Grasemann, P.; Klasen, R.; Kliemt, R.; Maas, F.; Maldaner, S.; Morales Morales, C.; Motzko, C.; Noll, O.; Pflüger, S.; Rodríguez Piñeiro, D.; Schupp, F.; Steinen, M.; Wolff, S.; Zimmermann, I.; Fedorov, A.; Kazlou, D.; Korzhik, M.; Missevitch, O.; Balashoff, A.; Boukharov, A.; Malyshev, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Golubev, A.; Goryachev, V.; Kantsyrev, A.; Kirin, D. Y.; Kristi, N.; Ladygina, E.; Luschevskaya, E.; Matveev, V. A.; Panjushkin, V.; Stavinskiy, A. V.; Basant, K. N.; Kumawat, H.; Roy, B.; Saxena, A.; Yogesh, S.; Bonaventura, D.; Brand, P.; Fritzsch, C.; Grieser, S.; Hargens, C.; Hergemöller, A. K.; Hetz, B.; Hüsken, N.; Kellers, J.; Khoukaz, A.; Bumrungkoh, D.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Manasatitpong, K.; Nasawad, T.; Pongampai, S.; Simantathammakul, T.; Srisawad, P.; Wongprachanukul, N.; Yan, Y.; Yu, C.; Zhang, X.; Zhu, W.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Antokhin, E.; Barnyakov, A. Yu.; Beloborodov, K.; Blinov, V. E.; Kuyanov, I. A.; Pivovarov, S.; Pyata, E.; Tikhonov, Y.; Kunne, R.; Ramstein, B.; Hunter, G.; Lattery, M.; Pace, H.; Boca, G.; Duda, D.; Finger, M.; Finger Jr., M.; Kveton, A.; Pesek, M.; Peskova, M.; Prochazka, I.; Slunecka, M.; Volf, M.; Gallus, P.; Jary, V.; Korchak, O.; Marcisovsky, M.; Neue, G.; Novy, J.; Tomasek, L.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A.; Ferapontov, V.; Goncharenko, Y.; Levin, A.; Maslova, E.; Melnik, Y.; Meschanin, A.; Minaev, N.; Mochalov, V.; Moiseev, V.; Morozov, D.; Nogach, L.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P.; Shein, I.; Uzunian, A.; Vasiliev, A.; Yakutin, A.; Roy, U.; Yabsley, B.; Belostotski, S.; Fedotov, G.; Gavrilov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O.; Zhdanov, A.; Atac, A.; Bäck, T.; Cederwall, B.; Makonyi, K.; Preston, M.; Tegner, P. E.; Wölbing, D.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.; Dobbs, S.; Eugenio, P.; Lersch, D.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Rivetti, A.; Wheadon, R.; Bussa, M. P.; Spataro, S.; Iazzi, F.; Lavagno, A.; Martin, A.; Akram, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Regina, J.; Schönning, K.; Wolke, M.; Diaz, J.; Pothodi Chackara, V.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Tarasiuk, J.; Wojciechowski, M.; Wronka, S.; Zwieglinski, B.; Amsler, C.; Bühler, P.; Kratochwil, N.; Marton, J.; Nalti, W.; Steinschaden, D.; Widmann, E.; Zimmermann, S.; Zmeskal, J.
Classificazione: 1 Contributo su Rivista
Abstract: The antiproton experiment PANDA at FAIR is designed to bring hadron physics to a new level in terms of scope, precision and accuracy. In this work, its unique capability for studies of hyperons is outlined. We discuss ground-state hyperons as diagnostic tools to study non-perturbative aspects of the strong interaction, and fundamental symmetries. New simulation studies have been carried out for two benchmark hyperon-antihyperon production channels: ¯→¯ and ¯→¯+−. The results, presented in detail in this paper, show that hyperon-antihyperon pairs from these reactions can be exclusively reconstructed with high efficiency and very low background contamination. In addition, the polarisation and spin correlations have been studied, exploiting the weak, self-analysing decay of hyperons and antihyperons. Two independent approaches to the finite efficiency have been applied and evaluated: one standard multidimensional efficiency correction approach, and one efficiency independent approach. The applicability of the latter was thoroughly evaluated for all channels, beam momenta and observables. The standard method yields good results in all cases, and shows that spin observables can be studied with high precision and accuracy already in the first phase of data taking with PANDA.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/289960

Magnetic Nanoparticles Coated with (R)-9-Acetoxystearic Acid for Biomedical Applications
ACS OMEGA
Autore/i: Micheletti, G.; Boga, C.; Telese, D.; Cassani, M. C.; Boanini, E.; Nitti, P.; Ballarin, B.; Ghirri, A.; Barucca, G.; Rinaldi, D.
Classificazione: 1 Contributo su Rivista
Abstract: The well-known ability to selectively drive nanomagnetic materials coated with anticancer drugs into tumor cells suggested the synthesis and the characterization of magnetic nanoparticles (MNPs) functionalized with (R)-9-acetoxystearic acid, the acetic ester of (R)-9-hydroxystearic acid (9-HSA), an antiproliferative agent active against different cancer cells. The acyl chloride of (R)-9-acetoxystearic acid, synthesized in two steps from 9-HSA, was reacted with (3-aminopropyl)triethoxysilane, chosen as a linker between MNPs and the stearyl moiety. In the last step, the novel amide was bound to magnetite NPs by reaction with silyl groups. A detailed structural, chemical, and magnetic characterization of the obtained material proved that it possesses properties in agreement with the requirements for drug delivery, opening the possibility to further insights focused on the 9-HSA biomedical applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/282802

Fringe modelling and Photoelastic stress Measurement method in tetragonal PWO observed in the plane normal to a crystallographic a-axis
JOURNAL OF INSTRUMENTATION
Autore/i: Natali, P. P.; Montalto, L.; Scalise, L.; Davi', F.; Paone, N.; Rinaldi, D.
Classificazione: 1 Contributo su Rivista
Abstract: Scintillator crystals like the tetragonal PbWO4 (PWO) are largely used in calorimeters, for instance the CMS at CERN and in the PANDA calorimeter project. The performances of those calorimeters are directly linked to crystals homogeneity and quality, which can be assessed using indicators such as residual stress state condition. Since it is fundamental to develop and refine new mathematical models for the structural characterization and stress analysis of the crystalline materials, in this paper we present a novel approach aimed at the evaluation of stress or defect distribution and inhomogeneity, by analysing images obtained with photoelastic conoscopic system. A new model is proposed for the correct mathematical interpretation of the fringe pattern obtained by investigating the crystal in direction orthogonal to the uniaxial optical axis and parallel to the crystallographic a-axis. The model will be validated against experimentally acquired fringe patterns. A comparison with a simplified procedure, which operatively, reduces the computational effort, will be detailed. After a complete description of the fringe pattern, a linearized model is proposed in such a way that we obtain a simple stress intensity evaluation via experimentally easy measurable parameters, thus realizing a model based measurement of stress state. The results make the proposed procedure reliable, and useful also for other crystals symmetries.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/283989

Scintillator crystals: Structure, characterization and models for better performances
Scintillator Crystals: Structure, Characterization and Models for Better Performances
Autore/i: Rinaldi, D.; Montalto, L.
Editore: MDPI AG
Luogo di pubblicazione: ;Postfach
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/285170

Adjusting the Néel relaxation time of Fe3O4/ZnxCo1-xFe2O4 core/shell nanoparticles for optimal heat generation in magnetic hyperthermia
NANOTECHNOLOGY
Autore/i: Fabris, Fernando; Lohr, Javier Hernán; Lima, Enio; de Almeida, Adriele Aparecida; Troiani, Horacio; Rodríguez, Luis M; Vásquez Mansilla, Marcelo; Aguirre, Myriam; Goya, Gerardo Fabian; Rinaldi, Daniele; Ghirri, Alberto; Peddis, Davide; Fiorani, Dino; Zysler, Roberto D; De Biasi, Emilio; Winkler, Elin
Classificazione: 1 Contributo su Rivista
Abstract: In this work it is shown a precise way to optimize the heat generation in high viscosity magnetic colloids, by adjusting the Néel relaxation time in core/shell bimagnetic nanoparticles, for Magnetic Fluid Hyperthermia applications. To pursue this goal, Fe3O4/ZnxCo1-xFe2O4 core/shell nanoparticles were synthesized with 8.5 nm mean core diameter, encapsulated in a shell of ~1.1 nm of thickness, where the Zn atomic ratio (Zn/(Zn+Co) at%) changes from 33 at% to 68 at%. The magnetic measurements are consistent with a rigid interface coupling between the core and shell phases, where the effective magnetic anisotropy systematically decreases when the Zn concentration increases, without a significant change of the saturation magnetization. Experiments of magnetic fluid hyperthermia of 0.1 wt% of these particles dispersed in water, DMEM (Dulbecco modified Eagles minimal essential medium) and a high viscosity butter oil, result in a large specific loss power (SLP), up to 150 W/g, when the experiments are performed at 571 kHz and 200 Oe. The SLP was optimized adjusting the shell composition, showing a maximum for intermediate Zn concentration. This study shows a way to maximize the heat generation in viscous media like cytosol, for those biomedical applications that requiere smaller particle sizes .
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/285085

Physics of matter: from the nanoscale structure to the macroscopic properties of materials
The First outstanding 50 years of "Università Politecnica delle Marche"
Autore/i: Albertini, G.; Barucca, G.; Francescangeli, O.; Lucchetta, D. E.; Lucchetti, L.; Mengucci, P.; Rinaldi, D.; Simoni, F.; Vita, F.
Editore: Springer
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/275117

On the photoelastic constants for anisotropic stressed crystals
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Rinaldi, D.; Davi', F.; Montalto, L.
Classificazione: 1 Contributo su Rivista
Abstract: The need for high-quality and high-performance crystals for high-energy physics (e.g. scintillators) and biomedical applications require a good knowledge of their mechanical and optical properties, amongst the others. This is a mandatory step in many quality control process aimed at the improvement of the technological processes for crystals growth. Following the first analysis already done for Tetragonal crystals, in this paper we study the elasto-optic behavior of optically biaxial (Monoclinic and Orthorhombic groups) and uniaxial crystals (Trigonal and Hexagonal groups). We evaluate the photoelastic constants, the optic angle and the optic plane associated to various states of stress, in terms of the components of the Piezo-Optic tensor.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269646

Monte Carlo optical simulations of a small FoV Gamma camera. Effect of scintillator thicknesses and Septa materials
CRYSTALS
Autore/i: Ricci, R.; Kostou, T.; Chatzipapas, K.; Fysikopoulos, E.; Loudos, G.; Montalto, L.; Scalise, L.; Rinaldi, D.; David, S.
Classificazione: 1 Contributo su Rivista
Abstract: Optical Monte Carlo simulations have been extensively used for the accurate modeling of light transport in scintillators for the improvement of detector designs. In the present work, a GATE Monte Carlo toolkit was used to study the effect of scintillator thicknesses and septa materials in the performance parameters evaluation of a commercially available small animal gamma-optical camera, named “γ-eye”. Firstly, the simulated γ-eye system was validated against experimental data. Then, part of the validated camera was modeled defining all of the optical properties by means of the UNIFIED model of GATE. Different CsI:Na scintillator crystals with varying thicknesses (from 4 mm up to 6 mm) and different reflector (septa) materials were simulated and compared in terms of sensitivity, light output and spatial resolution. Results have demonstrated the reliability of the model and indicate that the thicker crystal array presents higher sensitivity values, but degraded spatial resolution properties. Moreover, the use of black tape around crystals leads to an improvement in spatial resolution values compared to a standard white reflector material.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270300

Quality Control and Structural Assessment of Anisotropic Scintillating Crystals
CRYSTALS
Autore/i: Montalto, Luigi; Natali, PIER PAOLO; Scalise, Lorenzo; Paone, Nicola; Davi', Fabrizio; Rinaldi, Daniele; Barucca, Gianni; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: Nowadays, radiation detectors based on scintillating crystals are used in many different fields of science like medicine, aerospace, high energy physic and security. The scintillating crystals are the core elements of these devices; by converting high energy radiations in visible photons, they produce the optical signals to be detected and analyzed. Structural and surface conditions, defects and residual stress states play a crucial role in their operating performances like light production, transport and extraction. Industrial production of such crystalline materials is a complex process which requires sensing, in-line and off-line, for material characterization and process control to properly tune the production parameters. Indeed, scintillators quality must be accurately assessed during their manufacturing in order to prevent malfunction and failures at each level of the chain, optimizing the production and utilization costs. This paper presents an overview of the techniques used, at various stages, across the crystal production process, to assess quality and structural condition of anisotropic scintillating crystals. Different inspection techniques (XRD, SEM, EDX, TEM) and the non-invasive photoelasticity based methods for residual stress detection, such as Laser Conoscopy and Sphenoscopy, are presented. The use of XRD, SEM, EDX and TEM analytical methods offer detailed structural and morphological information. Conoscopy and Sphenoscopy offer the advantages of fast and non-invasive measurement methods suitable for the inspection of the whole crystal quality. These techniques, based on different measurement methods and models, provide different information which can be cross-correlated to obtain a complete characterization of the scintillating crystals. Inspection methods will be analyzed and compared in relation to present state of the art.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/267755

PANI/Au/Fe3O4 nanocomposite materials for high performance energy storage
ELECTROCHIMICA ACTA
Autore/i: Ballarin, B.; Boanini, E.; Montalto, L.; Mengucci, P.; Nanni, D.; Parise, C.; Ragazzini, I.; Rinaldi, D.; Sangiorgi, N.; Sanson, A.; Cassani, M. C.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270303

Precision resonance energy scans with the PANDA experiment at FAIR
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G; Davı, F; Lancioni, G; Mengucci, P; Montalto, L; Natali, P; Paone, N; Rinaldi, D; Scalise, L; Erni, W; Krusche, B; Steinacher, M; Walford, N; Cao, N; Liu, Z; Liu, C; Liu, B; Shen, X; Sun, S; Tao, J; Zhao, G; Zhao, J; Albrecht, M; Bökelmann, S; Erlen, T; Feldbauer, F; Fink, M; Frech, J; Freudenreich, V; Fritsch, M; Hagdorn, R; Heinsius, H; Held, T; Holtmann, T; Keshk, I; Koch, H; Kopf, B; Kuhlmann, M; Kümmel, M; Küßner, M; Leiber, S; Musiol, P; Mustafa, A; Pelizäus, M; Pitka, A; Reher, J; Reicherz, G; Richter, M; Schnier, C; Sersin, S; Sohl, L; Sowa, C; Steinke, M; Triffterer, T; Weber, T; Wiedner, U; Beck, R; Hammann, C; Hartmann, J; Ketzer, B; Müllers, J; Rossbach, M; Salisbury, B; Schmidt, C; Thoma, U; Urban, M; Bianconi, A; Bragadireanu, M; Pantea, D; Czyzycki, W; Domagala, M; Filo, G; Jaworowski, J; Krawczyk, M; Lisowski, E; Lisowski, F; Michałek, M; Płażek, J; Korcyl, K; Kozela, A; Kulessa, P; Lebiedowicz, P; Pysz, K; Schäfer, W; Szczurek, A; Fiutowski, T; Idzik, M; Swientek, K; Terlecki, P; Korcyl, G; Lalik, R; Malige, A; Moskal, P; Nowakowski, K; Przygoda, W; Rathod, N; Rudy, Z; Salabura, P; Smyrski, J; Augustin, I; Böhm, R; Lehmann, I; Nicmorus Marinescu, D; Schmitt, L; Varentsov, V; Al-Turany, M; Belias, A; Deppe, H; Dzhygadlo, R; Flemming, H; Gerhardt, A; Götzen, K; Heinz, A; Karabowicz, R; Kurilla, U; Lehmann, D; Lühning, J; Lynen, U; Nakhoul, S; Orth, H; Peters, K; Saito, T; Schepers, G; Schmidt, C J; Schwarz, C; Schwiening, J; Täschner, A; Traxler, M; Voss, B; Wieczorek, P; Abazov, V; Alexeev, G; Arefiev, V A; Astakhov, V; Barabanov, M Yu; Batyunya, B V; Dodokhov, V Kh; Fechtchenko, A; Galoyan, A; Golovanov, G; Koshurnikov, E K; Lobanov, Y Yu; Olshevskiy, A G; Piskun, A A; Samartsev, A; Shimanski, S; Skachkov, N B; Skachkova, A N; Strokovsky, E A; Tokmenin, V; Uzhinsky, V; Verkheev, A; Vodopianov, A; Zhuravlev, N I; Branford, D; Glazier, D; Watts, D; Böhm, M; Eyrich, W; Lehmann, A; Miehling, D; Pfaffinger, M; Stelter, S; Quin, N; Robison, L; Seth, K; Xiao, T; Bettoni, D; Ali, A; Hamdi, A; Krebs, M; Nerling, F; Belousov, A; Kisel, I; Kozlov, G; Pugach, M; Zyzak, M; Bianchi, N; Gianotti, P; Lucherini, V; Bracco, G; Bodenschatz, S; Brinkmann, K T; Diehl, S; Dormenev, V; Düren, M; Etzelmüller, E; Föhl, K; Galuska, M; Geßler, T; Gutz, E; Hahn, C; Hayrapetyan, A; Kesselkaul, M; Kühn, W; Lange, J S; Liang, Y; Metag, V; Moritz, M; Nanova, M; Novotny, R; Schmidt, M; Stenzel, H; Strickert, M; Thöring, U; Wasem, T; Wohlfahrt, B; Zaunick, H G; Tomasi-Gustafsson, E; Ireland, D; Seitz, B; Deepak, P N; Kulkarni, A; Apostolou, A; Kappert, R; Kavatsyuk, M; Loehner, H; Messchendorp, J; Rodin, V; Schakel, P; Vejdani, S; Dutta, K; Kalita, K; Sohlbach, H; Bianchi, L; Deermann, D; Derichs, A; Dosdall, R; Erven, A; Gillitzer, A; Goldenbaum, F; Grunwald, D; Jokhovets, L; Lai, A; Orfanitski, S; Prasuhn, D; Prencipe, E; Pütz, J; Ritman, J; Rosenthal, E; Schadmand, S; Schmitz, R; Sefzick, T; Serdyuk, V; Sterzenbach, G; Stockmanns, T; Wintz, P; Wüstner, P; Xu, H; Zhou, Y; Cao, X; Hu, Q; Li, H; Li, Z; Ma, X; Rigato, V; Isaksson, L; Achenbach, P; Aycock, A; Corell, O; Denig, A; Distler, M; Hoek, M; Lauth, W; Liu, Z; Merkel, H; Müller, U; Pochodzalla, J; Schlimme, S; Sfienti, C; Thiel, M; Zambrana, M; Ahmadi, H; Ahmed, S; Bleser, S; Bölting, M; Capozza, L; Dbeyssi, A; Grasemann, P; Klasen, R; Kliemt, R; Leithoff, H H; Maas, F; Maldaner, S; Michel, M; Morales Morales, C; Motzko, C; Noll, O; Pflüger, S; Rodríguez Piñeiro, D; Steinen, M; Wolff, S; Zimmermann, I; Fedorov, A; Korzhik, M; Missevitch, O; Balashoff, A; Boukharov, A; Malyshev, O; Balanutsa, P; Chernetsky, V; Demekhin, A; Dolgolenko, A; Fedorets, P; Gerasimov, A; Golubev, A; Goryachev, V; Kantsyrev, A; Kirin, D Y; Kotov, A; Kristi, N; Ladygina, E; Luschevskaya, E; Matveev, V A; Panjushkin, V; Stavinskiy, A V; Basant, K N; Jha, V; Kumawat, H; Mohanty, A K; Roy, B; Saxena, A; Yogesh, S; Bonaventura, D; Fritzsch, C; Grieser, S; Hargens, C; Hergemöller, A K; Hetz, B; Hüsken, N; Khoukaz, A; Wessels, J P; Herold, C; Khosonthongkee, K; Kobdaj, C; Limphirat, A; Nasawad, T; Simantathammakul, T; Srisawad, P; Yan, Y; Blinov, A E; Kononov, S; Kravchenko, E A; Antokhin, E; Barnyakov, M; Beloborodov, K; Blinov, V E; Kuyanov, I A; Pivovarov, S; Pyata, E; Tikhonov, Y; Kunne, R; Ramstein, B; Boca, G; Duda, D; Finger, M; Finger, M; Kveton, A; Pesek, M; Peskova, M; Prochazka, I; Slunecka, M; Gallus, P; Jary, V; Novy, J; Tomasek, M; Tomasek, L; Virius, M; Vrba, V; Abramov, V; Bukreeva, S; Chernichenko, S; Derevschikov, A; Ferapontov, V; Goncharenko, Y; Levin, A; Maslova, E; Melnik, Y; Meschanin, A; Minaev, N; Mochalov, V; Moiseev, V; Morozov, D; Nogach, L; Poslavskiy, S; Ryazantsev, A; Ryzhikov, S; Semenov, P; Shein, I; Uzunian, A; Vasiliev, A; Yakutin, A; Roy, U; Yabsley, B; Belostotski, S; Gavrilov, G; Izotov, A; Manaenkov, S; Miklukho, O; Veretennikov, D; Zhdanov, A; Makonyi, K; Preston, M; Tegner, P E; Wölbing, D; Atac, A; Bäck, T; Cederwall, B; Gandhi, K; Rai, A K; Godre, S; Calvo, D; De Remigis, P; Filippi, A; Mazza, G; Rivetti, A; Wheadon, R; Iazzi, F; Lavagno, A; Bussa, M P; Spataro, S; Martin, A; Akram, A; Calen, H; Ikegami Andersson, W; Johansson, T; Kupsc, A; Marciniewski, P; Papenbrock, M; Regina, J; Schönning, K; Wolke, M; Diaz, J; Pothodi Chackara, V; Chlopik, A; Kesik, G; Melnychuk, D; Trzcinski, A; Wojciechowski, M; Wronka, S; Zwieglinski, B; Amsler, C; Bühler, P; Kratochwil, N; Marton, J; Nalti, W; Steinschaden, D; Suzuki, K; Widmann, E; Zimmermann, S; Zmeskal, J
Classificazione: 1 Contributo su Rivista
Abstract: This paper summarises a comprehensive Monte Carlo simulation study for precision resonance energy scan measurements. Apart from the proof of principle for natural width and line shape measurements of very narrow resonances with PANDA, the achievable sensitivities are quantified for the concrete example of the charmonium-like X(3872) state discussed to be exotic, and for a larger parameter space of various assumed signal cross-sections, input widths and luminosity combinations. PANDA is the only experiment that will be able to perform precision resonance energy scans of such narrow states with quantum numbers of spin and parities that differ from {$} J^{{}PC{}} = 1^{{}--{}}{$}JPC=1--.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264613

Non-invasive inspection of anisotropic crystals: innovative Photoelasticity based methods
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Autore/i: Natali, P. P.; Montalto, L.; Rinaldi, D.; Davì, F.; Paone, N.; Scalise, L.
Classificazione: 1 Contributo su Rivista
Abstract: The mass production of new generations of high quality and very performant scintillating crystals requires sophisticated measurement systems and inspection tools in order to have reliable and precise data from such anisotropic materials. These measurement systems must be compatible with the industrial requirements and must to be able to provide effective feedbacks aimed to the control of the crystals production quality. In this work, a set of photoelasticity-based methods, solving the main limits of the presently available inspection systems, are presented. The main characteristics of such methods are the noninvasiveness, precision and speed which are well suited for their use in the industry environment. The paper describes a set of measurement techniques and reports on real experimental data obtained on crystals having different cutting geometries respect to the optic axes. The use of the proposed measurement methods, from laser Conoscopy to laser Sphenoscopy, along the optic axis and orthogonal to it, therefore provides a portfolio of noninvasive measurement techniques and therefore it is opening valuable spaces for the quality control of crystals in a production environment, optimising important aspects such as the time duration of the inspection and its spatial resolution.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254285

Theoretical and experimental evaluation of piezo-optic parameters and photoelastic constant in Tetragonal PWO
APPLIED OPTICS
Autore/i: Natali, PIER PAOLO; Montalto, Luigi; Daví, Fabrizio; Mengucci, Paolo; Ciriaco, Andrea; Paone, Nicola; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: The tetragonal PbWO4 (PWO) is one of the most important scintillating crystals, being used both into CMS at CERN and in the PANDA project at FAIR. Light yield and other relevant scintillation properties depend, among many factors, also on the crystal mechanical quality. Accordingly, a detailed knowledge of crystal piezo-optic properties is a mandatory step towards understanding its the elasto-optic behaviour and to perform crystal quality control. In this paper we evaluatefor the first time, by means of both from photoelastic and X-ray measurements, some components of the piezo-optic tensor; moreover, when the crystal is acted upon by an uniaxial stress, we obtain an evaluation for angle of rotation angle of the optic plane under stress as well as the photoelastic constant. These parameters are necessary in order to detect the residual stresses within the crystal, if any, and to give an overall quality measure. Such a methodology is in general suitable for any tetragonal crystals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252420

On the photoelastic constants and the Brewster law for stressed tetragonal crystals
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
Autore/i: Rinaldi, D.; Davì, F.; Montalto, L.
Classificazione: 1 Contributo su Rivista
Abstract: An exact knowledge of the mechanical and optical properties of crystals allows not only for theoretical advances, it is also an useful tool to asses crystal quality in the technological processes of growth and production of advanced crystals like e.g. scintillators. In this paper we study the elasto-optic behavior of tetragonal crystals in order to evaluate the photoelastic constants, associated to various states of stress, in terms of the components of the Piezo-Optic tensor. Moreover we arrive at a generalization, for tetragonal crystals, of the Brewster law for optically isotropic materials.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252439

Influence of a Surface Finishing Method on Light Collection Behaviour of PWO Scintillator Crystals
PHOTONICS
Autore/i: Rinaldi, Daniele; Montalto, Luigi; Lebeau, Michel; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262514

Barium and lithium silicate glass ceramics doped with rare earth ions for white LEDs
OPTICAL MATERIALS
Autore/i: Trusova, E.; Vaitkevičius, A.; Tratsiak, Y.; Korjik, M.; Mengucci, P.; Rinaldi, D.; Montalto, L.; Marciulionyte, V.; Tamulaitis, G.
Classificazione: 1 Contributo su Rivista
Abstract: Novel glasses and glass ceramics with compositions corresponding to stoichiometric lithium and barium dis- ilicates and doped with different combinations of Ce3+, Eu2+,3+, Tb3+, and Dy3+ have been fabricated and studied as prospective light converters for white high-power light emitting diodes and laser diodes. Spatially resolved photoluminescence spectroscopy and structural analysis have been employed. The emission spectra and CIE color coordinates of these materials evidence their good prospective as phosphors for white light sources. Structural analysis proves a high level of crystallization of the ceramics fabricated by annealing the glasses, while spectroscopic study revealed the influence of crystallization on the emission properties of this system. The results show a high potential of these materials be exploited as temperature-resistant phosphors in high-power white light emitting diodes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/261546

Characterization of a defective PbWO$_4$ crystal cut along the a-c crystallographic plane: structural assessment and a novel photoelastic stress analysis
JOURNAL OF INSTRUMENTATION
Autore/i: Montalto, Luigi; Natali, PIER PAOLO; Davi', Fabrizio; Mengucci, Paolo; Paone, Nicola; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: Among scintillators, the PWO is one of the most widely used, for instance in CMS calorimeter at CERN and PANDA project. Crystallographic structure and chemical composition as well as residual stress condition, are indicators of homogeneity and good quality of the crystal. In this paper, structural characterization of a defective PbWO$_4$ (PWO) crystal has been performed by X-ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Photoelasticity in the unusual $(a, c)$ crystallographic plane. XRD and EDS analysis have been used to investigate crystallographic orientation and chemical composition, while stress distribution, which indicates macroscopic inhomogeneities and defects, has been obtained by photoelastic approaches, in Conoscopic and Sphenoscopic configuration. Since the sample is cut along the $(a, c)$ crystallographic plane, a new method is proposed for the interpretation of the fringe pattern. The structural analysis has detected odds from the nominal lattice dimension, which can be attributed to the strong presence of Pb and W. A strong inhomogeneity over the crystal sample has been revealed by the photoelastic inspection. The results give reliability to the proposed procedure which is exploitable in crystals with other structures.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252357

Structural Characterization and Absolute Luminescence Efficiency Evaluation of Gd2O2S High Packing Density Ceramic Screens Doped with Tb3+ and Eu3+ for further Applications in Radiology
JOURNAL OF PHYSICS. CONFERENCE SERIES
Autore/i: Dezi, Anna; Monachesi, Elenasophie; D'Ignazio, Michela; Scalise, Lorenzo; Montalto, Luigi; Paone, Nicola; Rinaldi, Daniele; Mengucci, Paolo; Loudos, George; Bakas, Athanasios; Michail, Christos; Valais, Ioannis; Fountzoula, Christine; Fountos, George; David, Stratos
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254632

Superspin glass state in a diluted nanoparticle system stabilized by interparticle interactions mediated by an antiferromagnetic matrix
NANOTECHNOLOGY
Autore/i: Margaris, G; Vasilakaki, M; Peddis, D; Trohidou, K. N; Laureti, S; Binns, C; Agostinelli, E; Rinaldi, Daniele; Mathieu, R; Fiorani, D.
Classificazione: 1 Contributo su Rivista
Abstract: In nanoparticle systems consisting of two magnetic materials (bi-magnetic nanoparticles or nanoparticles embedded in a magnetic matrix), there is a constantly growing interest in the investigation of the interplay between interparticle interactions and the nanoparticle-matrix interface exchange coupling, because of its enormous impact on a number of technological applications. The understanding of the mechanisms of such interplay is a great challenge, as it would allow controlling equilibrium and non-equilibrium magnetization dynamics of exchange coupled nanoparticles systems and finely tuning their anisotropy. Here, we provide evidence that this interplay leads to a collective superspin glass (SSG) behavior in a system of diluted ferromagnetic (FM) nanoparticles embedded in an antiferromagnetic (AFM) matrix (5% volume fraction of Co particles in Mn film matrix). We have developed a novel mesoscopic model to study the influence of interparticle interaction on the exchange bias (EB) and the dynamical behavior of assemblies of FM nanoparticles embedded in a granular AFM matrix. Our mesoscopic model is based on reducing the amount of simulated spins to the minimum number necessary to describe the magnetic structure of the system and introducing the adequate exchange parameters between the different spins. The model replicates remarkably well the observed static and dynamical SSG properties as well as the EB behavior. In addition, the proposed model well explains the role of the significant Co/Mn alloying and of the granularity of the matrix in mediating interparticle interactions through exchange and dipole-dipole coupling between the uncompensated moments of its grains and the exchange interaction at the Co/Mn interface.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/241816

Optimization of the photoelastic fringe pattern processing for the stress evaluation in scintillating anisotropic media
I2MTC 2017 - 2017 IEEE International Instrumentation and Measurement Technology Conference, Proceedings
Autore/i: Natali, PIER PAOLO; Montalto, Luigi; Davi', Fabrizio; Paone, Nicola; Rinaldi, Daniele; Scalise, Lorenzo
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Scintillating media are used in numbers of fields, from the high-energy physics to the biomedical devices, like those for the cancer detection and characterization, passing through the laser technology and industry processes control. Their performances must be enhanced in order to accomplish to the more and more sophisticated needs of the applications. Residual stress conditions are crucial for the correct performance of these materials. Moreover, an accurate study of the internal stress leads to a proper setting of the production process and prevent unwanted fractures of the brittle media. Non-invasive photoelastic methods are particularly suitable for the purpose; producing fringe pattern images which are a signature of the crystal state. These methods have to be supported of algorithms dedicated to the image analysis, so to extract geometrical parameters of the fringe pattern. Here an optimized algorithm to analyze the fringe pattern acquired by a laser based polariscope is discussed. This algorithm has been optimized and automated so to reduce the measurement uncertainty, considering a time saving procedure. The implemented procedure makes the software able to recognize the ROI in the acquired image and reduces the uncertainty by a factor 3.5.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250498

Comparative Evaluation of Cesium Iodide Scintillators Coupled to a Silicon Photomultiplier (SiPM): Effect of Thickness and Doping on the scintillators
JOURNAL OF PHYSICS. CONFERENCE SERIES
Autore/i: Monachesi, ELENA SOPHIE; Dezi, Anna; D'Ignazio, Michela; Scalise, L.; Montalto, L.; Paone, N.; Rinaldi, D.; Loudos, G.; David, S.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254631

Exchange bias and surface effects in bimagnetic CoO-core/Co0.5Ni0.5Fe2O4-shell nanoparticles
PHYSICAL REVIEW. B
Autore/i: Lavorato, Gabriel; Winkler, Elin; Ghirri, Alberto; Lima, Enio; Peddis, Davide; Troiani, Horacio E.; Fiorani, Dino; Agostinelli, Elisabetta; Rinaldi, Daniele; Zysler, Roberto D.
Classificazione: 1 Contributo su Rivista
Abstract: Bimagnetic nanoparticles have been proposed for the design of new materials with controlled properties, which requires a comprehensive investigation of their magnetic behavior due to multiple effects arising from their complex structure. In this work we fabricated bimagnetic core/shell nanoparticles formed by an ∼3-nm antiferromagnetic (AFM) CoO core encapsulated within an ∼1.5-nm ferrimagnetic (FiM) Co0.5Ni0.5Fe2O4 shell, aiming at studying the enhancement of the magnetic anisotropy and the surface effects of a ferrimagnetic oxide shell. The magnetic properties of as-synthesized and annealed samples were analyzed by ac and dc magnetization measurements. The results indicate that the magnetic response of the as-synthesized particles is governed by the superparamagnetic behavior of the interacting nanoaggregates of spins that constitute the disordered ferrimagnetic shell, whose total moments block at ⟨TB ⟩ = 49 K and collectively freeze in a superspin-glass-type state at ⟨Tg ⟩ = 3 K. On the other hand, annealed nanoparticles are superparamagnetic at room temperature and behave as an exchange-coupled system below the blocking temperature ⟨TB ⟩ = 70 K, with enhanced coercivity HC (10 K) ∼ 14.6 kOe and exchange bias field HEB (10 K) ∼ 2.3 kOe, compared with the as-synthesized system where HC (10 K) ∼ 5.5 kOe and HEB (10 K) ∼ 0.8 kOe. Our results, interpreted using different models for thermally activated and surface relaxation processes, can help clarify the complex magnetic behavior of many core/shell and hollow nanoparticle systems.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/238568

Photoelastic sphenoscopic analysis of crystals
REVIEW OF SCIENTIFIC INSTRUMENTS
Autore/i: Montalto, Luigi; Rinaldi, Daniele; Scalise, Lorenzo; Paone, Nicola; Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: Birefringent crystals are at the basis of various devices used in many fields, from high energy physics to biomedical imaging for cancer detection. Since crystals are the main elements of those devices, a great attention is paid on their quality and properties. Here, we present a methodology for the photoelastic analysis of birefringent crystals, based on a modified polariscope. Polariscopes using conoscopic observation are used to evaluate crystals residual stresses in a precise but time consuming way; in our methodology, the light beam shape, which impinges on the crystal surface, has been changed from a solid cone (conoscopy) to a wedge (sphenoscopy). Since the polarized and coherent light is focused on a line rather than on a spot, this allows a faster analysis which leads to the observation, at a glance, of a spatial distribution of stress along a line. Three samples of lead tungstate crystals have been observed using this technique, and the obtained results are compared with the conoscopic observation. The samples have been tested both in unloaded condition and in a loaded configuration induced by means of a four points bending device, which allows to induce a known stress distribution in the crystal. The obtained results confirm, in a reliable manner, the sensitivity of the methodology to the crystal structure and stress.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/230333

From Conoscopy to Sphenoscopy: New Experimental Methods in Crystals Inspections
Proceedings of 18th Italian National Conference on Photonic Technologies (Fotonica 2016)
Autore/i: Montalto, Luigi; Rinaldi, Daniele; Scalise, Lorenzo; Paone, Nicola; Davi', Fabrizio
Editore: IET: The Institution of Engineering and Technology
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Naturally birefringent crystals are fundamental components of devices with many fields of application, from high energy physics and biomedical devices, to lasers. Crystals functional properties are related to their quality. Non-destructive tests are mandatory to check and improve the quality of these expensive materials as well as to control the growth process. In this paper, a set of methods are presented, based on photoelasticity. The classical diffuse light Photoelasticity, laser Conoscopy and laser Sphenoscopy are discussed and compared. Each technique has shown reliability and sensitivity to the crystal stress condition. The work discusses the main characteristics of these techniques; from the simple optical set-up of the diffuse light technique, limited to volume measurements, to the extremely high resolution of the laser Conoscopy achieved through a more complex optical lay-out and, finally, to the fast and easy data analysis of Sphenoscopy.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245108

Bertin surfaces and residual stress analysis in scintillating crystals
Proceedings XXII Convegno AIMETA
Autore/i: Davi', Fabrizio; Rinaldi, Daniele
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Scintillating crystals are employed in high-energy physics, in medical imaging, diagnostic and security because they are capable to convert gamma-rays and in general high-energy particles into light. The effectiveness of the crystal and the light production can be severely affected by the presence of defects or residual stresses generated by the crystal growth process. Photoelastic analysis is one of the most used investigation techniques for crystal properties characterization: here we present a detailed analysis of the residual stress in PWO which is based on the results obtained elsewhere by the Authors.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227211

Inspection of birefringent media by photoelasticity: from diffuse light polariscope to laser conoscopic technique
OPTICAL ENGINEERING
Autore/i: Montalto, Luigi; Paone, Nicola; Rinaldi, Daniele; Scalise, Lorenzo
Classificazione: 1 Contributo su Rivista
Abstract: A reliable and noninvasive measurement method for the inspection of naturally birefringent transparent media is presented in this paper. It allows us to achieve a spatially resolved analysis of the stress state of birefringent materials. The developed system is based on photoelasticity and exploits a controlled laser conoscopy technique and a scanning system to perform local measurements in the volume dimensions of the media, which can be displaced over a grid of points. The configuration of the proposed laser conoscopic system is presented, and a dedicated algorithm, designed to perform digital analysis of the fringe patterns, is also described. The design and the realization of the system are discussed, as well as the advantages of the proposed system over the classic diffuse light polariscope technique. The method has been experimentally validated through laboratory tests on birefringent samples with known induced stress. The system has demonstrated its sensitivity to stress and its capability to achieve a spatial resolution on the order of 0.1 mm to resolve stress gradients (uncertainty on the stress amplitude of +/-0.1 MPa).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227043

Flux Pinning in Y- and Ag-Doped MgB2
ADVANCES IN MATERIALS PHYSICS AND CHEMISTRY
Autore/i: Dyson, Jack; Rinaldi, Daniele; Barucca, Gianni; Albertini, Gianni; Sprio, Simone; Tampieri, Anna
Classificazione: 1 Contributo su Rivista
Abstract: High temperature superconductor research is presently concentrated upon the flux pinning properties of the Abrikosov lattice of the mixed-mode superconducting phase. The temperature thermal fluctuations, current and magnetic field unpin the flux vortices and so cause electromagnetic resistivity in high temperature superconductors. Materials with higher vortex pinning exhibit less resistivity and are more attractive for industrial uses. In the present article, we measured and correlated the pinning flux energy barrier, determined by AC magnetic measurements, and transmission electron microscopy measurements to the critical current Jc in Yttrium- and Silver-doped MgB2 superconductors. The energy of the flux vortex was evaluated as a function of the magnetic field. The energy barrier curves suggest an optimal doping level to occur in doped materials. This result only depends on the optimal size and distribution of precipitates, and not on their chemical composition. The energy barriers have been compared with that of undoped MgB2 in literature.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228103

Structural, mechanical and light yield characterisation of heat treated LYSO:Ce single crystals for medical imaging applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Mengucci, Paolo; G., André; E., Auffray; Barucca, Gianni; C., Cecchi; R., Chipaux; A., Cousson; Davi', Fabrizio; N., Di Vara; Rinaldi, Daniele; Santecchia, Eleonora
Classificazione: 1 Contributo su Rivista
Abstract: Five single crystals of cerium-doped lutetium yttrium oxyorthosilicate (LYSO:Ce) grown by the Czochralski method were submitted to structural characterization by X-ray (XRD) and neutron (ND) diffraction, scanning (SEM) and transmission (TEM) electron microscopy and energy dispersive microanalysis (EDS).The Ultimate Tensile Strength (UTS), the Young Modulus (YM) and the Light Yield (LY) of the samples were also measured in order to correlate the mechanical and the optical behavior of the crystals with the characteristics of their microstructure. Two of the samples analysed were also heat treated at 300°C for 10 h to evidence possible variations induced by the temperature in the optical and mechanical response of the crystals. Results showed that the mean compositional variations evidenced by the structural analyses do not affect the mechanical and optical behavior of the samples. On the contrary, the therma treatment could induce the formation of coherent spherical particles (size 10 to 15 nm), not uniformly distributed inside the sample, that strongly reduce the UTS and YM values, but it does not affect the optical response of the crystal. This latter result was attributed to the low value o fthe heating temperature (300 °C) that is not sufficiently high to induce annealing of the oxygen vacancies traps that are responsible of the deterioration of the scintillation properties of the LYSO:Ce crystals. This study was carried out in the framework of the Crystal Clear Collaboration (CCC).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/221515

A photoelastic measurement system for residual stress analysis in scintillating crystals by conoscopic imaging
REVIEW OF SCIENTIFIC INSTRUMENTS
Autore/i: Montalto, Luigi; Paone, Nicola; Scalise, Lorenzo; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: The assessment of the stress state of scintillating crystals is an important issue for producers as well as users of such materials, because residual stress may arise during growth process. In this paper, a measurement system, based on the use of a photoelastic, conoscopic optical setup, is proposed for the assessment of stress state in scintillating crystals. Local stress values can be measured on the crystal in order to observe their spatial distribution. With the proposed system, it is possible to vary the dimensions of the inspected measurement volume. It has been validated with reference to a known stress state induced in a birefringent crystal sample and it has been tested for the case of loaded and unloaded samples, showing sub-millimetric spatial resolution and stress uncertainty <= 0.25 MPa. The proposed measurement system is a valid method for the inspection of scintillating crystals required by producers and users of such materials.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227039

Mechanical and optical properties of anisotropic single-crystal prisms.
JOURNAL OF ELASTICITY
Autore/i: Davi', Fabrizio; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: The great interest in scintillating crystals, is related to their applications in the high energy physics, biomedicine and security. For this reason a complete characterization and understanding of their structural, optical and mechanical properties at the macroscopic level is necessary. We must give a complete theoretical characterization of the mechanics and optics of bulk prismatic single-crystal bodies in order to design experiments. This work shall deal solely with the theoretical description within the framework of linear theories.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/203513

A PHOTOELASTICITY MEASUREMENT SET-UP FOR THE ASSESSMENT OF RESIDUAL STRESSES IN SCINTILLATING CRYSTALS
Atti del III Congresso Nazionale del Coordinamento della Meccanica Italiana
Autore/i: Montalto, Luigi; Scalise, Lorenzo; Rinaldi, Daniele; Paone, Nicola
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/175110

Beyond the Effect of Particle Size: Influence of CoFe2O4 Nanoparticle Arrangements on Magnetic Properties
CHEMISTRY OF MATERIALS
Autore/i: D., Peddis; C., Cannas; A., Musinu; A., Ardu; F., Orru; D., Fiorani; S., Laureti; Rinaldi, Daniele; G., Muscas; G., Concas; G., Piccaluga
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/105862

Magnetic Properties of Small Magnetite Nanocrystals
JOURNAL OF PHYSICAL CHEMISTRY. C
Autore/i: G., Muscas; G., Concas; C., Cannas; A., Musinu; A., Ardu; F., Orru; D., Fiorani; S., Laureti; Rinaldi, Daniele; G., Piccaluga; D., Peddis
Classificazione: 1 Contributo su Rivista
Abstract: This paper focuses on the study of the magnetic properties of 9 nm magnetite nanocrystals. XRD and TEM measurements indicate the presence of crystalline particles, with a fraction of them only partially crystallized or highly defective. The analysis of the temperature dependence of the Zero-Field-Cooled/Field-Cooled magnetization and of the thermoremanent magnetization provides evidence of the existence of three magnetic regimes: an high temperature regime (300 – 100 K), an intermediate regime (100- 20 K) and a low temperature regime (below 20K). The characteristics of such regimes are discussed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/118271

Characterization of cerium-doped LYSO scintillating crystals
Proceedings of Microscopy Conference (MC) 2013, Regensburg (D), Part 1
Autore/i: Santecchia, Eleonora; Barucca, Gianni; DI CRISTOFORO, Adriano; Rinaldi, Daniele; Tiberi, Emanuele; Mengucci, Paolo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251529

Study Of Microstructure And Magnetization Reversal Mechanism In Granular CoCrPt:SiO2 Films Of Variable Thickness
MATERIALS CHEMISTRY AND PHYSICS
Autore/i: G., Varvaro; A. M., Testa; E., Agostinelli; D., Fiorani; S., Laureti; F., Springer; C., Brombacher; M., Albrecht; L., Del Bianco; Barucca, Gianni; Mengucci, Paolo; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: The effect of the thickness and microstructural features on the switching behaviour of granular CoCrPt:SiO2 films with perpendicular magnetic anisotropy was investigated. TEM plane view and cross section analysis indicate that, while the very first layers grow as uniform nanograins in close contact, the growth proceeds by formation of well-defined CoCrPt columnar islands (7 nm average size) separated by the silicon oxide, the distance among the islands remaining roughly constant along the whole thickness. The relation between such non-uniform microstructure and the magnetization reversal mechanism at room temperature was investigated by performing hysteresis loops at variable angle as well as time dependent measurements by using a vector vibrating sample magnetometer. Numerical micromagnetic simulations of the hysteresis loops have been carried out to support the description of the experimental observations. The results showed a coexistence of coherent and incoherent reversal processes, the former being more and more pronounced with increasing the magnetic layer thickness, consistently with the microstructural investigations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/105863

Superparamagnetic blocking and superspin-glass freezing in ultra small δ-(Fe0.67Mn0.33)OOH particles
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Autore/i: Peddis, D.; Rinaldi, Daniele; Ennas, G.; Scano, A.; Agostinelli, E.; Fiorani, D.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/65977

Elastic moduli and optical properties of LYSO crystals: theory and experiments.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Autore/i: Davi', Fabrizio; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: Abstract—In order to obtain a complete characterization and understanding of the structural, optical andmechanical properties of LYSO scintillanting crystals, we studied a mechanical, optical and photoelastic model for a cylindrical prism of square cross-section bent by applied loads. This is the starting point which is necessary in order to design a set ofmechanical, electrical and optical experiments aimed to obtain the characterization of the macroscopical behavior of LYSO and similar crystals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/64806

Quality Control and Characterization of Scintillating Crystals for High Energy Physics and Medical Applications
WIDE SPECTRA OF QUALITY CONTROL
Autore/i: Rinaldi, Daniele; Lebeau, M.; Paone, Nicola; Scalise, Lorenzo; Pietroni, P.
Editore: Intech
Luogo di pubblicazione: Rijeka, Croatia
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62362

Measurement of ultimate tensile strenght and Young modulus in LYSO scintillating crystals
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Scalise, Lorenzo; Rinaldi, Daniele; Davi', Fabrizio; Paone, Nicola
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/59928

Quality control on pre-serial Bridgman production of PbWO4 scintillating crystals by means of photoelasticity
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Rinaldi, Daniele; A., Ciriaco; M., Lebeau; Paone, Nicola
Classificazione: 1 Contributo su Rivista
Abstract: Residual internal stresses in PbWO4 (PWO) scintillating crystals grown by Bridgman method have been systematically studied. Residual stresses, induced during growth, play an important role in production yield. Cracking probability during cutting as well as stable mechanical properties in finished crystal are closely related to internal stress level. A regular production of good-quality crystals requires a fast and easy feed-back on growth parameters. Samples from a pre-serial production were analyzed in order to give the producer a quality feed-back for process optimization. By means of photoelasticity, we measured residual stress distribution in several sections along the growth axis and for typical positions in every section. The stress analysis revealed defects occurring during the crystallization process, attributed to dislocations, lattice disorientation and poly-crystallinity. This work had been prompted by the need for quality monitoring of a pre-serial production of PWO for CMS experiment. Mapping stress levels inside the ingot volume and proposing a synthetic parameter to be used as a quality indicator, the resulting analysis should contribute to parameter optimization and improve the growth performance. The proposed method can be useful in general crystal production.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51983

THERMAL HYSTERESIS OF MORIN TRANSITION IN HEMATITE PARTICLES
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Autore/i: Suber, L.; Imperatori, P.; Mari, A.; Marchegiani, G.; VASQUEZ MANSILLA, M.; Fiorani, D.; Plunkett, W. R.; Rinaldi, D.; Cannas, C.; Ennas, G.; Peddis, D.
Classificazione: 1 Contributo su Rivista
Abstract: Rhombohedral shaped, single crystal hematite particles ( = 93 nm) with narrow size distribution were prepared by hydrolysis of iron chloride and polymerisation in water. The results of field dependent magnetization measurements at different warming(W)/cooling(C) rate, and AC susceptibility measurements at variable frequency are reported and discussed. Thermal hysteresis associated to the Morin transition and field dependence of the Morin temperature (TM) are observed in warming-cooling cycles (TM = 25 K and 13 K for H = 0.1 T and 3 T, respectively) due to the first order phase transition. A frequency dependence of AC susceptibility is observed above TM, as a result of the relaxation of the magnetic moment of hematite particles in the weak-ferromagnetic phase.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38580

Isochromate fringes simulation by Cassini-like curves for photoelastic analysis of birefringent crystals
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Rinaldi, Daniele; Pietroni, Paolo; Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: In optically birefringent uniaxial and biaxial crystals, analyzed by plane polariscope, isochromate interference fringes can be observed. By means of the classical electromagnetic theory a Cassini-like analytical equation of the isochromate fringes, depending on the refraction indexes, has been obtained. The proposed analytical equation is a useful tool to evaluate the internal stress state, as it is related to the isochromate shapes owing to the induced variation of the refraction indexes. Uniaxial crystals can assume complex biaxial behaviour due to particular stress configurations. PbWO4 (PWO) uniaxial scintillating crystals have been studied. The Cassini-like curves fit well experimental measurements in the case of uniaxial stress. In this research work, a simple model has been proved in the case of strong isochromate fringes distortion due to a stress gradient induced by the bending load. The model fits well the interference pattern, acquired experimentally. This study can pave the way for the quality control on scintillating crystals, used in the fields of high-energy detectors, security and biomedical applications, with complex internal stress state.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51387

SURFACE SPIN-GLASS FREEZING IN INTERACTING CORE–SHELL NiO NANOPARTICLES
NANOTECHNOLOGY
Autore/i: Winkler, E.; Zysler, R. D.; VASQUEZ MANSILLA, M.; Fiorani, D.; Rinaldi, D.; Vasilakaki, M.; Trohidou, K. N.
Classificazione: 1 Contributo su Rivista
Abstract: Magnetization and AC susceptibility measurements have been performed on ~3 nm NiO nanoparticles in powder form. The results indicate that the structure of the particles can be considered as consisting of an antiferromagnetically ordered core, with an uncompensated magnetic moment, and a magnetically disordered surface shell. The core magnetic moments block progressively with decreasing temperature, according to the distribution of their anisotropy energy barriers, as shown by a broad maximum of the low field zero-field-cooled magnetization (MZFC) and in the in-phase component χ' of the AC susceptibility, centred at ~70 K. On the other hand, surface spins thermally fluctuate and freeze in a disordered spin-glass-like state at much lower temperature, as shown by a peak in MZFC (at 17 K, for H = 50 Oe) and in χ'. The temperature of the high temperature χ' peak changes with frequency according to the Arrhenius law; instead, for the low temperature maximum a power law dependence of the relaxation time was found, τ = τ0(Tg/(T(ν)−Tg))α, where α = 8, like in spin glasses, τ0 = 10−12 s and Tg = 15.9 K. The low temperature surface spin freezing is accompanied by a strong enhancement of magnetic anisotropy, as shown by the rapid increase of coercivity and high field susceptibility. Monte Carlo simulations for core/shell antiferromagnetic particles, with an antiferromagnetic core and a disordered shell, reproduce the qualitative behaviour of the temperature dependence of the coercivity. Interparticle interactions lead to a shift to a high temperature of the distribution of the core moment blocking temperature and to a reduction of magnetization dynamics.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38529

STRUCTURE AND SUPERCONDUCTING PROPERTIES OF PURE AND VARIOUSLY DOPED BULK MgB2 OBTAINED BY UNIAXIAL AND ISOSTATIC HOT PRESSING
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Autore/i: S., Sprio; Rinaldi, Daniele; G., Celotti; E., Pialorsi; A., Tampieri
Editore: Kluwer Academic Publishers:Journals Department, PO Box 322, 3300 AH Dordrecht Netherlands:011 31 78 6576050, EMAIL: frontoffice@wkap.nl, kluweronline@wkap.nl, INTERNET: http://www.kluwerlaw.com, Fax: 011 31 78 6576254
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38528

PWO photo-elastic parameter calibration by laser-based polariscope
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Ciriaco, A; Davi', Fabrizio; Lebeau, M; Majni, Giuseppe; Paone, Nicola; Pietroni, P; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: We systematically measured the photo-elastic parameter f s of PbWO4 (PWO) for crystals of different thicknesses. We observed a linear behaviour of f s as a function of the thickness for low level applied stresses. This result was corroborated by numerical simulations. f s allows the evaluation of the residual internal stress, useful for crystal quality control. In this work, we also propose a new polariscope based on laser light, which allows a fast measurement and mapping of the internal stress of crystals with high resolution owing to the reduced laser-beam dimension.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50708

QUALITY MONITORING IN PWO SCINTILLATING CRYSTAL PRODUCTION DURING R&D PHASE
Proceedings of the 8th International Conference on Inorganic Scintillators and their Use in Scientific and Industrial Applications
Autore/i: Lebeau, M; Ciriaco, A; Gobbi, L; Majni, Giuseppe; Paone, Nicola; Pietroni, P; Rinaldi, Daniele
Editore: National Academy of Sciences of Ukraine
Luogo di pubblicazione: KHARKOV
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52051

Light collection dependence on polishing method
Proceedings of the 8th International Conference on Inorganic Scintillators and their Use in Scientific and Industrial Applications
Autore/i: M., Lebeau; C., Armataffet; A., Ciriaco; A., DI CRISTOFORO; Mengucci, Paolo; R., Paramatti; Rinaldi, Daniele
Editore: National Academy of Sciences of Ukraine
Luogo di pubblicazione: KHARKOV
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/49030

Magnetotransport properties of spin-glass-like layered compounds La1-xSr1+xCoO4 (0≤x≤0.40)
SOLID STATE SCIENCES
Autore/i: SÁNCHEZ-ANDÚJAR, M.; Rinaldi, D.; Caciuffo, R.; Mira, J.; Rivas, J.; SEÑARÍS-RODRÍGUEZ, M. A.
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Abstract: We report the magnetic and transport properties of the cobalt layered mixed-oxides La1−x Sr1+x CoO4 (0 x 0.40). An evolution towards an anomalous “cluster-glass”-like behavior as x increases has been found. The onset of the ferromagnetic order in the layered phases occurs at around 150 K followed by a blocking process around 125 K. Also, present in the magnetic response of these materials is the signal coming from small intergrowths of a perovskite phase, also detected by TEM, although invisible for powder-X-ray diffraction. From the electrical point of view these materials are semiconducting and their resistivity decreases upon doping. Most interestingly, at low temperature these layered compounds show rather large magnetoresistance (MR). The highest effect is found in the sample with x = 0.20 that shows a magnetoresistance MRmax = −24% at T =15KunderafieldHmax=50kOe.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38527

Complex dynamics of self-generated magnetic clusters in phase-separated perovskites
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: Rivas, J.; Mira, J.; Rinaldi, Daniele; Caciuffo, ROBERTO GIOVANNI MARIA; SENARIS RODRIGUEZ, M. A.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50073

Surface quality inspection of PbWO4 crystals by grazing incidence X-ray diffraction
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Mengucci, Paolo; A., DI CRISTOFORO; M., Lebeau; Majni, Giuseppe; Paone, Nicola; P., Pietroni; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50436

Mapping residual stresses in PbWO4 crystals using photo-elastic analysis
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: M., Lebeau; L., Gobbi; Majni, Giuseppe; Paone, Nicola; P., Pietroni; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: Large scintillating crystals are affected by internal stresses induced by the crystal growth temperature gradient remanence. Cutting boules (ingots) into finished crystal shapes allows for a partial tension relaxation but residual stresses remain the main cause of breaking. Quality control of residual stresses is essential in the application of Scintillating Crystals to high-energy physics calorimeters (e.g. CMS ECAL at CERN LHC). In this context the industrial process optimisation towards stress reduction is mandatory. We propose a fast technique for testing samples during the production process in order to evaluate the residual stress distribution after the first phases of mechanical processing. We mapped the stress distribution in PbWO 4 slabs cut from the same production boule. The analysis technique is based on the stress intensity determination using the photo-elastic properties of the samples. The stress distribution is mapped in each sample. The analysis shows that there are regions of high residual tension close to the seed position and at the boule periphery. These results should allow for adapting the industrial process to producing crystals with lower residual stresses.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50583

Development of non-destructive Young's modulus measurement techniques in non-oriented CeF3 crystals
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: P., Pietroni; Paone, Nicola; M., Lebeau; Majni, Giuseppe; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51227

Magnetic order in the lamellar compounds La1-xSr1+xCoO4 (0 < x < 0.4)
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: M., SÁNCHEZ ANDÚJAR; B., RIVAS MURIAS; Rinaldi, Daniele; Caciuffo, ROBERTO GIOVANNI MARIA; J., Mira; J., Rivas; M. A., SEÑARÍS RODRÍGUEZ
Classificazione: 1 Contributo su Rivista
Abstract: We have studied the AC and DC magnetic properties of the lamellar compounds La1
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53144

Dynamic magnetic response of LaMn0.5Ga0.5O3
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: Rinaldi, Daniele; Caciuffo, ROBERTO GIOVANNI MARIA; J. J., Neumeier; D., Fiorani; S. B., Oseroff
Classificazione: 1 Contributo su Rivista
Abstract: The results of linear and non-linear magnetic AC susceptibility measurements are reported for polycrystalline LaMn0.5Ga0.5O3. The observation of an asymmetric peak in the linear AC response at 59 K, accompanied by the development of a sizeable second-harmonic component and of a double-peak third-harmonic signal, suggests the establishment of a long-range ordered magnetic ground state with unconventional dynamics. The results are compatible with a picture assuming a canted antiferromagnetic structure or the presence of ferromagnetic domains embedded in an antiferromagnetic matrix.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51005

Interparticle magnetic correlations in a nanosized γ-Fe2O3 system
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: Carsughi, Flavio; Baio, G.; Rinaldi, Daniele; Guidi, T.; Caciuffo, ROBERTO GIOVANNI MARIA; Fiorani, D.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50286

STUDY OF THE SINTERING BEHAVIOUR OF MgB2 SUPERCONDUCTOR DURING HOT-PRESSING
PHYSICA. C, SUPERCONDUCTIVITY
Autore/i: A., Tampieri; G., Celotti; S., Sprio; R., Caciuffo; Rinaldi, Daniele
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Abstract: The densification behaviour of MgB2 was studied when commercial powder was hot-pressed in the temperature range 1070–1190 C. The mechanisms active during sintering were investigated by continuously recording the shrinkage vs. time and elaborating the data on the basis of Kingery’s model for liquid phase sintering. XRD and SEM analysis on final dense bodies were used to evaluate secondary phases formation during sintering and the effect of magnesium sublimation. AC magnetic susceptibility measurements were also performed to correlate the microstructural and morphological modifications induced by hot-pressing and the superconducting properties.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38322

EFFECTS OF Cu AND OTHER METALLING DOPINGS ON THE SUPERCONDUCTING PROPERTIES OF MgB2
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Autore/i: A., Tampieri; G., Celotti; S., Sprio; Rinaldi, Daniele
Editore: World Scientific Publishing Company:PO Box 128, Farrer Road, Singapore 912805 Singapore:011 65 6 4665775, EMAIL: journal@wspc.com.sg, INTERNET: http://www.wspc.com.sg, http://www.worldscinet.com, Fax: 011 65 6 4677667
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38321

Effects of copper doping in MgB2 superconductor
SOLID STATE COMMUNICATIONS
Autore/i: Tampieri, A.; Celotti, G.; Sprio, S.; Rinaldi, Daniele; Barucca, Gianni; Caciuffo, ROBERTO GIOVANNI MARIA
Classificazione: 1 Contributo su Rivista
Abstract: Magnesium diboride, recently discovered as superconductor, is extremely interesting in respect to pairing mechanisms and phonon-mediated superconductivity, but its transition temperature (39K) is decidedly too low for practical applications. A rush for substitutions started, intended to raise Tc and possibly maintain acceptable critical current density. The difficult introduction of Cu was attempted, through a complex procedure employing CuB24 instead of metallic Cu: owing to the tendency of Cu to form inter-metallic compounds with Mg, only a maximum of 3mol% of Cu was safely substituted to Mg in MgB2 lattice and a small parameters contraction proportional to Cu content was recorded. The results are a decrease in Tc of about 0.5 K, not far from that found with Al addition, whose reasons are discussed and interpreted in terms of holes doping.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50228

FABRICATION AND CHARACTERIZATION OF Hg-BASED SUPERCONDUCTIVE THIN FILMS
PHYSICA. C, SUPERCONDUCTIVITY
Autore/i: M., Bindi; F., Fuso; E. ARIMONDO A., Tampieri; G., Celotti; Rinaldi, Daniele
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38320

Quality inspection of anisotropic scintillating lead tungstate (PbWO4) crystals through measurement of interferometric fringe pattern parameters
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: N., Cocozzela; M., Lebeau; Majni, Giuseppe; Paone, Nicola; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50952

Low Temperature Dynamical Magnetic Behaviour in Nanocrystalline Fe
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: L., DEL BIANCO; E., Bonetti; D., Fiorani; Rinaldi, Daniele; Caciuffo, ROBERTO GIOVANNI MARIA; A., Hernando
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52973

Phase separation as origin of the magnetic anomalies in La0.85Sr0.15CoO3
JOURNAL OF APPLIED PHYSICS
Autore/i: J., Mira; J., Rivas; G., Baio; Barucca, Gianni; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; D., Fiorani; M. A., SEÑARÌS RODRÌGUEZ
Classificazione: 1 Contributo su Rivista
Abstract: The dependence of the ac-magnetic susceptibility of La0.85Sr0.15CoO3 on the annealing temperature used during synthesis is addressed. Such dependence has been previously attributed to compositional inhomogeneities. Nevertheless, the presence of distinct phases with different chemical compositions is excluded after explorations by several techniques. Instead it is proposed that an electronic phase separation takes place in the material, whose state is changed after charge-carrier redistributions due to the thermal history of the samples, analogously to parent manganese-based perovskites.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52125

QUALITY INSPECTION OF ANISOTROPIC SCINTILLATING CRYSTALS TROUGH MEASUREMENT OF INTERFEROMETRIC FRINGE PATTERN PARAMETERS
Proceedings of: The Fifth International Conference On Inorganic Scintillators And Their Applications - SCINT99
Autore/i: N., Cocozzella; M., Lebeau; G., Majni; Paone, Nicola; Rinaldi, Daniele
Editore: Faculty of Physics, M.V. Lomonosov Moscow State Un
Luogo di pubblicazione: MOSCOW
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48236

Phase separation, thermal history and magnetic behaviour of Sr doped LaCoO3
JOURNAL OF PHYSICS. CONDENSED MATTER
Autore/i: G., Baio; Barucca, Gianni; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; J., Mira; J., Rivas; M. A., SEÑARÌS RODRIGUEZ; D., Fiorani
Classificazione: 1 Contributo su Rivista
Abstract: High-resolution transmission electron microscopy observations and magnetic ac susceptibility measurements have been carried out to study the changes in the magnetic properties of La1-xSrxCoO3 samples (x less than or equal to 0.3) processed at different annealing temperatures, ranging from 1273 to 1573 K. Although neutron diffraction excludes the coexistence of distinct phases with different chemical composition, room temperature micrographs taken along the [0, -1, 1] rhombohedral zone-axis show bright fringes of different widths, extending over regions with sizes ranging from 8 to 40 nm. These regions are detected in all the samples, whatever the Sr content or the annealing temperature T-a. However, their number depends strongly on the processing conditions and becomes smaller and smaller as T-a increases. The periodicity of the bright fringes cannot be accounted for, either by variations in the sample thickness or by crystallographic defects, but it can be simulated if the presence of aperiodically alternate Sr-rich and La-rich (0, 1, 1) planes is assumed. On the other hand, the susceptibility measurements show that the amount of ferromagnetic phase present in each specimen depends on its thermal history. This suggests that the segregation of a second electronic phase takes place, the nucleation of which is influenced by the spatial homogeneity of the dopant distribution.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53257

Disordered magnetism at the grain boundary of pure nanocrystalline iron
PHYSICAL REVIEW LETTERS
Autore/i: E., Bonetti; L., Delbianco; D., Fiorani; Rinaldi, Daniele; Caciuffo, ROBERTO GIOVANNI MARIA
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51844

APPLICATION OF HOT ISOSTATIC PRESSING IN THE SYNTHESIS OF HG-BASED SUPERCONDUCTORS
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Autore/i: G., Celotti; A., Tampieri; Rinaldi, Daniele
Editore: IEEE / Institute of Electrical and Electronics Engineers Incorporated:445 Hoes Lane:Piscataway, NJ 08854:(800)701-4333, (732)981-0060, EMAIL: subscription-service@ieee.org, INTERNET: http://www.ieee.org, Fax: (732)981-9667
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38314

Static and dynamic magnetic response of CeFe2
JOURNAL OF APPLIED PHYSICS
Autore/i: Caciuffo, ROBERTO GIOVANNI MARIA; J. C., Griveau; D., Kolberg; F., Wastin; Rinaldi, Daniele; A., Panchula; P., Canfield
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51840

GRANULAR AND INTERGRANULAR PROPERTIES OF HOT PRESSED BSCCO (2223) SUPERCONDUCTORS
JOURNAL OF MATERIALS SCIENCE
Autore/i: A., Tampieri; D., Fiorani; N., Sparvieri; Rinaldi, Daniele; G., Celotti; R., Bartolucci
Editore: Kluwer Academic Publishers:Journals Department, PO Box 322, 3300 AH Dordrecht Netherlands:011 31 78 6576050, EMAIL: frontoffice@wkap.nl, kluweronline@wkap.nl, INTERNET: http://www.kluwerlaw.com, Fax: 011 31 78 6576254
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38315

Quality inspection in anisotropic scintillating crystals through measurement of interferometric fringe pattern parameters
Scint99 - International Conference - Moscow
Autore/i: N., Cocozzella; M., Lebeau; G., Majni; Paone, Nicola; Rinaldi, Daniele
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/46263

CHARACTERISTICS OF HG-BASED SUPERCONDUCTORS PREPARED AT 0.2 GPa BY HIP
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Autore/i: G., Celotti; A., Tampieri; Rinaldi, Daniele
Editore: World Scientific Publishing Company:PO Box 128, Farrer Road, Singapore 912805 Singapore:011 65 6 4665775, EMAIL: journal@wspc.com.sg, INTERNET: http://www.wspc.com.sg, http://www.worldscinet.com, Fax: 011 65 6 4677667
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38316

Investigation of static and dynamic magnetic properties of Joule heated Co10Cu90 ribbons
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: D., Fiorani; A. M., Testa; E., Agostinelli; P., Imperatori; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; P., Tiberto; F., Vinai; P., Allia
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53418

STUDY OF MAGNETIC PROPERTIES OF JOULE HEATED GRANULAR CoxCu100-x RIBBONS
JOURNAL OF METASTABLE AND NANOCRYSTALLINE MATERIALS
Autore/i: D., Fiorani; A. M., Testa; E., Agostinelli; P., Imperatori; R., Caciuffo; Rinaldi, Daniele; P., Tiberto; F., Vinai; P., Allia
Editore: Trans Tech Publications
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38263

Structural details and magnetic order of La1-xSrxCoO3 (x ≤ 0.3).
PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Autore/i: R., Caciuffo; Rinaldi, Daniele; Barucca, Gianni; J., Mira; J., Rivas; M. A., SEÑARÌS RODRÌGUEZ; P. G., Radaelli; D., Fiorani; J. B., Goodenough
Classificazione: 1 Contributo su Rivista
Abstract: The crystallographic structure and the magnetic order of the distorted perovskite La1-xSrxCoO3 (0.10≤x ≤0.30) has been studied by neutron diffraction, high-resolution electron microscopy, and magnetic-susceptibility measurements. The results give direct evidence for an inhomogeneous distribution of the Sr2+ ions and the segregation of the material into hole-rich ferromagnetic regions and a hole-poor semiconducting matrix at lower values of x. The holes introduced by Sr doping are attracted to the Sr2+ ions where they stabilize to lowest temperatures an intermediate-spin state at neighboring trivalent cobalt. The antibonding e electrons so stabilized increase the mean unit-cell volume and are delocalized over the cobalt atoms of the cluster where they couple the localized t5 configurations ferromagnetically. Long-range ferromagnetic order between clusters is realized even for Sr doping as low as x=0.10. The transition to a spin glass state is observed only for Sr concentrations smaller than 0.10. The volume of a hole-rich cluster grows in a magnetic field, and the origin of the large negative magnetoresistance observed near Tc for 0.15 ≤ x ≤ 0.25 appears to be due to a growth of the clusters to a percolation threshold. For x=0.30, the σ* band of the intermediate-spin state below Tc is at the threshold of a transition from itinerant to polaronic conduction and, above Tc, the system transforms smoothly to a cluster state.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52847

Low temperature magnetic properties of fcc FeRh obtained by ball milling
Materials Science Forum
Autore/i: E., Navarro; D., Fiorani; R., Yavari; M., Rosenberg; M., Multigner; A., Hernando; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; S., Gialanella
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51537

PREPARATION OF Hg-1201 SUPERCONDUCTOR BY HOT ISOSTATIC PRESSING
PHYSICA. C, SUPERCONDUCTIVITY
Autore/i: A., Tampieri; G., Calestani; G., Celotti; C., Micheletti; Rinaldi, Daniele
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/39089

THE AC MAGNETIC SUSCEPTIBILITY AND THE IRREVERSIBLE EFFECT IN HTSC MATRIALS
ROMANIAN REPORTS IN PHYSICS
Autore/i: I., Pop; Rinaldi, Daniele; G., Majni
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/39088

PHOTOELASTICIMETRY FOR THE INSPECTION OF MECHANICAL STRESSES IN BIREFRINGENT MONOAXIAL CRYSTALS. APPLICATION TO PbWO4
Proceedings of the International Conference on INORGANIC SCINTILLATORS AND THEIR APPLICATIONS, SCINT 97
Autore/i: M., Lebeau; Rinaldi, Daniele
Editore: Press of Chinese Academy of Science - Shanghai
Luogo di pubblicazione: SHANGHAI
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48235

Static and dynamic magnetic properties of melt-spun granular CoxCu100-x alloys
MATERIALS SCIENCE FORUM
Autore/i: E., Agostinelli; P., Allia; Caciuffo, ROBERTO GIOVANNI MARIA; D., Fiorani; Rinaldi, Daniele; A. M., Testa; P., Tiberto; F., Vinai
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53013

Photoelasticity for the investigation of internal stress in BGO scintillating crystals
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: M., Lebeau; Majni, Giuseppe; Paone, Nicola; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50556

ALTERNATING CURRENT MAGNETIC SUSCEPTIBILITY MEASUREMENTS IN La1-xSrxCoO3 (x≤0.3) below 300 K
JOURNAL OF APPLIED PHYSICS
Autore/i: J., Mira; J., Rivas; R. D., Sánchez; M. A., SEÑARIS RODRIGUEZ; D., Fiorani; Rinaldi, Daniele; R., Caciuffo
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/39086

Dynamic magnetic behaviour of interacting g-Fe2O3 nanoparticles dispersed in epoxy resine
IEEE TRANSACTIONS ON MAGNETICS
Autore/i: J., Mira; J. A., LOPEZ PEREZ; J., Rivas; M. A., LOPEZ QUINTELA; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; D., Fiorani
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52364

APPLICATIONS OF PHOTOELASTICITY TO QUALITY INSPECTION OF SCINTILLATING CRYSTALS
Proceedings of the International Conference on INORGANIC SCINTILLATORS AND THEIR APPLICATIONS
Autore/i: M., Lebeau; G., Majni; Paone, Nicola; Rinaldi, Daniele
Editore: Delft University Press
Luogo di pubblicazione: DELFT
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/49029

Thermal treatment dependence of the magnetic dynamic behaviour of Gd2CuO4
JOURNAL OF APPLIED PHYSICS
Autore/i: J., Mira; J., Rivas; D., Fiorani; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; C., VASQUEZ VASQUEZ; J., Mahia; A., LOPEZ QUINTELA; S. B., Oseroff
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53272

An X-Ray Study of a Smectic C and Smectic A Liquid Crystal Polyacrylate
JOURNAL DE PHYSIQUE II
Autore/i: Francescangeli, Oriano; Rinaldi, Daniele; M., Laus; G., Galli; B., Gallot
Classificazione: 1 Contributo su Rivista
Abstract: An X-ray study was performed on powder specimens and on stretched oriented fibres of a smectic polyacrylate. The X-ray diffraction patterns showed the existence of monolayer smectic A. and bilayer smectic C mesophases that coexisted over a well defined range of temperature. In the latter mesophase the mesogenic groups were tilted with respect to the smectic layer normal by an angle beta approximate to 30 degrees. The electron density profile rho(z) along the direction normal to the smectic layers in the smectic C mesophase was determined by Fourier inversion and indicated the presence of a minor interdigitation of the terminal substituents. The phase problem related to the Fourier inversion was solved by using a pattern recognition approach based on the histogram of the electron density map. The positional smectic layer order parameters were also calculated for the first five harmonics of the positional distribution function of the smectic layers and their values suggested a well ordered layer structure.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53012

CRYSTAL GROWTH AND CHARACTERIZATION OF MnIn2SxSe4-x SINGLE CRYSTALS
Magnetism, magnetic materials and their applications
Autore/i: H., Romero; V., Sagredo; D., Fiorani; A. M., Testa; Rinaldi, Daniele; R., Caciuffo
Editore: World Scientific Publ.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48238

Size and structural effects on the magnetic behaviour of Gd2CuO4 particles
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Autore/i: J., Mira; J., Rivas; D., Fiorani; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; C., VASQUEZ VASQUEZ; J., Mahia; M. A., LOPEZ QUINTELA; S. B., Oseroff
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51939

An ac magnetic susceptibility study on Gd2CuO4 particles obtained by sol-gel methods.
Fourth Euro Ceramics - Vol. 6, Part I - High Tc Superconductors - pp. 407 - 414 Edited by A.Barone, D.Fiorani, A.Tampieri - Gruppo Editoriale Faenza Editrice S.p.A.
Autore/i: J., Mira; J., Rivas; D., Fiorani; Caciuffo, ROBERTO GIOVANNI MARIA; Rinaldi, Daniele; C., VASQUEZ VASQUEZ; J., Mahia; A., LOPEZ QUINTELA; S. B., Oseroff
Editore: Gruppo Editoriale Faenza
Luogo di pubblicazione: FAENZA
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53591