71 pubblicazioni classificate nel seguente modo:

Coupled bulk and lattice waves in crystals seen as micromorphic anisotropic continua, with an application to crystals of the tetragonal group
ADVANCES IN APPLIED MECHANICS
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: We study the coupled macroscopic and lattice wave propagation in anisotropic crystals seen as continua with affine microstructure (or micromorphic). In the general anisotropic case we obtain qualitative informations on frequencies and dispersion relations. We also show that in any anisotropic crystal we have three acoustic and nine optic waves. These results are then specialized to the crystals of the tetragonal point group for various propagation directions: exact representation for the acoustic and optic frequencies and for the coupled vibrations modes are obtained for propagation directions along the tetragonal c-axis as well as for some special directions orthogonal to it.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/324592

Status of the GINGER project
AVS QUANTUM SCIENCE
Autore/i: Altucci, Carlo; Bajardi, Francesco; Basti, Andrea; Beverini, Nicolò; Carelli, Giorgio; Capozziello, Salvatore; Castellano, Simone; Ciampini, Donatella; Davi', Fabrizio; Dell'Isola, Francesco; De Luca, Gaetano; Devoti, Roberto; Di Somma, Giuseppe; Di Virgilio, Angela D. V.; Fuso, Francesco; Giorgio, Ivan; Govoni, Aladino; Maccioni, Enrico; Marsili, Paolo; Ortolan, Antonello; Porzio, Alberto; Ruggiero, Matteo Luca; Velotta, Raffaele
Classificazione: 1 Contributo su Rivista
Abstract: Large frame ring laser gyroscopes, based on the Sagnac effect, are top sensitivity instrumentation to measure angular velocity with respect to the fixed stars. GINGER (Gyroscopes IN GEneral Relativity) project foresees the construction of an array of three large dimension ring laser gyroscopes, rigidly connected to the Earth. GINGER has the potentiality to measure general relativity effects and Lorentz Violation in the gravity sector, once a sensitivity of 10^-9, or better, of the Earth rotation rate is obtained. Being attached to the Earth crust, the array will also provide useful data for geophysical investigation. For this purpose, it is at present under construction as part of the multi-components obser- vatory called Underground Geophysics at Gran Sasso (UGSS). Sensitivity is the key point to determine the relevance of this instrument for fundamental science. The most recent progress in the sensitivity measurement, obtained on a ring laser prototype called GINGERINO, indi- cates that GINGER should reach the level of 1 part in 10^11 of the Earth rotation rate.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/323531

GINGER
MATHEMATICS AND MECHANICS OF COMPLEX SYSTEMS
Autore/i: Carelli, Giorgio; Capozziello, Salvatore; Castellano, Simone; Ciampini, Donatella; Davi', Fabrizio; De Luca, Gaetano; Devoti, Roberto; Di Giovambattista, Rita; Di Somma, Giuseppe; Di Stefano, Giuseppe; Di Virgilio, Angela D. V.; Famiani, Daniela; Frepoli, Alberto; Fuso, Francesco; Giorgio, Ivan; Govoni, Aladino; Lambiase, Gaetano; Maccioni, Enrico; Marsili, Paolo; Mercuri, Alessia; Morsani, Fabio; Ortolan, Antonello; Porzio, Alberto; Luca Ruggiero, Matteo; Tallini, Marco; Tasson, Jay; Turco, Emilio; Velotta, Raffaele
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, we outline the scientific objectives, the experimental layout, and the collaborations envisaged for the GINGER (Gyroscopes IN GEneral Relativity) project. The GINGER project brings together different scientific disciplines aiming at building an array of Ring Laser Gyroscopes (RLGs), exploiting the Sagnac effect, to measure continuously, with sensitivity better than pico- rad/s, large bandwidth (ca. 1 kHz), and high dynamic range, the absolute angular rotation rate of the Earth. In the paper, we address the feasibility of the apparatus with respect to the ambitious specifications above, as well as prove how such an apparatus, which will be able to detect strong Earthquakes, very weak geodetic signals, as well as general relativity effects like Lense-Thirring and de Sitter, will help scientific advancements in Theoretical Physics, Geophysics, and Geodesy, among other scientific fields.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/318271

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

A mechanical derivation of the evolution equation for scintillating crystals: Recombination-diffusion-drift equations, gradient flows and Wasserstein measures
MECHANICS RESEARCH COMMUNICATIONS
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: In a series of previous papers we obtained, by the means of the mechanics of continua with microstructure, the Reaction-Diffusion-Drift equation which describes the evolution of charge carriers in scintillators. Here we deal, first of all, with the consequences of constitutive assumptions for the entropic and dissipative terms. In the case of Boltzmann–Gibbs entropy, we show that the equation admits a gradient flows structure: moreover, we show that the drift-diffusion part is a Wasserstein gradient flow and we show how the energy dissipation is correlated with an appropriate Wasserstein distance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/324313

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

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

On the constitutive assumptions for a continuum model of scintillating crystals
Theoretical Analyses, Computations, and Experiments of Multiscale Materials A Tribute to Francesco dell’Isola.
Autore/i: Davi', Fabrizio
Editore: Springer
Luogo di pubblicazione: Cham
Classificazione: 2 Contributo in Volume
Abstract: For inorganic scintillating crystals, we show how the evolution equation for the charge carriers densities can be obtained by modeling the crystal as a continuum with structure. The resulting equation is a Reaction-Diffusion-Drift one. We deal with various hypotheses on the reaction/recombination term which are induced by two different choices for the associated entropy, namely those based either on the Gibbs-Boltzmann or Fermi–Dirac statistics.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/299381

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

Technical design report for the endcap disc DIRC
JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS
Autore/i: Davi', F.; Erni, W.; Krusche, B.; Steinacher, M.; Walford, N.; Liu, H.; Liu, Z.; Liu, B.; Shen, X.; Wang, C.; Zhao, J.; Albrecht, M.; Erlen, T.; Feldbauer, F.; Fink, M.; Freudenreich, V.; Fritsch, M.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kuhlmann, M.; Kummel, M.; Leiber, S.; Musiol, P.; Mustafa, A.; Pelizaus, M.; Pitka, A.; Reicherz, G.; Richter, M.; Schnier, C.; Schroder, T.; Sersin, S.; Sohl, L.; Sowa, C.; Steinke, M.; Triffterer, T.; Wiedner, U.; Beck, R.; Hammann, C.; Hartmann, J.; Ketzer, B.; Kube, M.; Rossbach, M.; Schmidt, C.; Schmitz, R.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Czyzycki, W.; Domagala, M.; Filo, G.; Jaworowski, J.; Krawczyk, M.; Lisowski, E.; Lisowski, F.; Michalk, M.; Plazek, J.; Korcyl, K.; Kozela, A.; Kulessa, P.; Lebiedowicz, P.; Pysz, K.; Schafer, W.; Szczurek, A.; Fiutowski, T.; Idzik, M.; Mindur, B.; Swientek, K.; Biernat, J.; Kamys, B.; Kistryn, S.; Korcyl, G.; Krzemien, W.; Magiera, A.; Moskal, P.; Przygoda, W.; Rudy, Z.; Salabura, P.; Smyrski, J.; Strzempek, P.; Wronska, A.; Augustin, I.; Bohm, R.; Lehmann, I.; Nicmorus Marinescu, D.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Divani Veis, N.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Gotzen, K.; Karabowicz, R.; Kurilla, U.; Lehmann, D.; Lochner, S.; Luhning, J.; Lynen, U.; Nakhoul, S.; Orth, H.; Peters, K.; Saito, T.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Taschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Wilms, A.; Abazov, V.; Alexeev, G.; Arefiev, V. A.; Astakhov, V.; Barabanov, M. Y.; Batyunya, B. V.; Dodokhov, V. K.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Y.; Lobanov, V. I.; Malyshev, V.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Sapozhnikov, M. G.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Zinchenko, A.; Branford, D.; Glazier, D.; Watts, D.; Bohm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Stelter, S.; Uhlig, F.; Dobbs, S.; Seth, K.; Tomaradze, A.; Xiao, T.; Bettoni, D.; Ali, A.; Hamdi, A.; Krebs, M.; Nerling, F.; Akishina, V.; Gorbunov, S.; Kisel, I.; Kozlov, G.; Pugach, M.; Zyzak, M.; Bianchi, N.; Gianotti, P.; Guaraldo, C.; Lucherini, V.; Bracco, G.; Bodenschatz, S.; Brinkmann, K. T.; Di Pietro, V.; Diehl, S.; Dormenev, V.; Duren, M.; Etzelmuller, E.; Fohl, K.; Galuska, M.; Gessler, T.; Gutz, E.; Hahn, C.; Hayrapetyan, A.; Kesselkaul, M.; Kuhn, W.; Kuske, T.; Lange, J. S.; Liang, Y.; Merle, O.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Quagli, T.; Riccardi, A.; Rieke, J.; Schmidt, M.; Schnell, R.; Stenzel, H.; Strickert, M.; Thoring, U.; Wasem, T.; Wohlfahrt, B.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Ireland, D.; Rosner, G.; Seitz, B.; Deepak, P. N.; Kulkarni, A.; Apostolou, A.; Babai, M.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; Schakel, P.; Tiemens, M.; van der Weele, J. C.; Vejdani, S.; Dutta, K.; Kalita, K.; Sohlbach, H.; Bai, M.; Bianchi, L.; Buscher, M.; Derichs, A.; Dosdall, R.; Erven, A.; Fracassi, V.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kemmerling, G.; Kleines, H.; Lai, A.; Lehrach, A.; Mikirtychyants, M.; Orfanitski, S.; Prasuhn, D.; Prencipe, E.; Putz, J.; Ritman, J.; Rosenthal, E.; Schadmand, S.; Sefzick, T.; Serdyuk, V.; Sterzenbach, G.; Stockmanns, T.; Wintz, P.; Wustner, P.; Xu, H.; Zhou, Y.; Li, Z.; Ma, X.; Xu, H.; Rigato, V.; Isaksson, L.; Achenbach, P.; Aycock, A.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Liu, Z.; Merkel, H.; Muller, U.; Pochodzalla, J.; Sanchez, S.; Schlimme, S.; Sfienti, C.; Thiel, M.; Zambrana, M.; Ahmadi, H.; Ahmed, S.; Bleser, S.; Capozza, L.; Cardinali, M.; Dbeyssi, A.; Ehret, A.; Frohlich, B.; Grasemann, P.; Haasler, S.; Izard, D.; Jorge, J.; Khaneft, D.; Klasen, R.; Kliemt, R.; Kohler, J.; Leithoff, H. H.; Lin, D.; Maas, F.; Maldaner, S.; Michel, M.; Mora Espi, M. C.; Morales Morales, C.; Motzko, C.; Noll, O.; Pfluger, S.; Rodriguez Pineiro, D.; Steinen, M.; Walaa, E.; Wolff, S.; Zimmermann, I.; Fedorov, A.; Korzhik, M.; Missevitch, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Goryachev, V.; Kirin, D. Y.; Matveev, V. A.; Stavinskiy, A. V.; Balashoff, A.; Boukharov, A.; Malyshev, O.; Marishev, I.; Chandratre, V.; Datar, V.; Jha, V.; Kumawat, H.; Mohanty, A. K.; Parmar, A.; Rai, A. K.; Roy, B.; Sonika, G.; Fritzsch, C.; Grieser, S.; Hergemoller, A. K.; Hetz, B.; Husken, N.; Khoukaz, A.; Wessels, J. P.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Srisawad, P.; Yan, Y.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Antokhin, E.; Barnyakov, M.; Barnyakov, A. Y.; Beloborodov, K.; Blinov, V. E.; Bobrovnikov, V. S.; Kuyanov, I. A.; Onuchin, A. P.; Pivovarov, S.; Pyata, E.; Serednyakov, S.; Tikhonov, Y.; Kunne, R.; Marchand, D.; Ramstein, B.; van de Wiele, J.; Wang, Y.; Boca, G.; Burian, V.; Finger, M.; Finger, M.; Nikolovova, A.; Pesek, M.; Peskova, M.; Pfeffer, M.; Prochazka, I.; Slunecka, M.; Gallus, P.; Jary, V.; Novy, J.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Belikov, N.; Bukreeva, S.; Davidenko, A.; Derevschikov, A.; Goncharenko, Y.; Grishin, V.; Kachanov, V.; Kormilitsin, V.; Levin, A.; Melnik, Y.; Minaev, N.; Mochalov, 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.; Back, T.; Cederwall, B.; Makonyi, K.; Preston, M.; Tegner, P. E.; Wolbing, D.; Godre, S.; Bussa, M. P.; Marcello, S.; Spataro, S.; Iazzi, F.; Introzzi, R.; Lavagno, A.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Rivetti, A.; Wheadon, R.; Martin, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Pettersson, J.; Regina, J.; Schonning, K.; Wolke, M.; Diaz, J.; Pothodi Chackara, V.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Slowinski, B.; Trzcinski, A.; Wojciechowski, M.; Wronka, S.; Zwieglinski, B.; Buhler, P.; Marton, J.; Steinschaden, D.; Suzuki, K.; Widmann, E.; Zimmermann, S.; Zmeskal, J.
Classificazione: 1 Contributo su Rivista
Abstract: PANDA (anti-proton annihiliation at Darmstadt) is planned to be one of the four main experiments at the future international accelerator complex FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. It is going to address fundamental questions of hadron physics and quantum chromodynamics using cooled antiproton beams with a high intensity and and momenta between 1.5 and 15 GeV/c. PANDA is designed to reach a maximum luminosity of 2 × 1032 cm−2 s. Most of the physics programs require an excellent particle identification (PID). The PID of hadronic states at the forward endcap of the target spectrometer will be done by a fast and compact Cherenkov detector that uses the detection of internally reflected Cherenkov light (DIRC) principle. It is designed to cover the polar angle range from 5° to 22° and to provide a separation power for the separation of charged pions and kaons up to 3 standard deviations (s.d.) for particle momenta up to 4 GeV/c in order to cover the important particle phase space. This document describes the technical design and the expected performance of the novel PANDA disc DIRC detector that has not been used in any other high energy physics experiment before. The performance has been studied with Monte-Carlo simulations and various beam tests at DESY and CERN. The final design meets all PANDA requirements and guarantees sufficient safety margins.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/310310

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

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

Wave propagation in micromorphic anisotropic continua with an application to tetragonal crystals
MATHEMATICS AND MECHANICS OF SOLIDS
Autore/i: Davì, Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: We study the coupled macroscopic and lattice wave propagation in anisotropic crystals seen as continua with affine microstructure (or micromorphic). In the general case we obtain qualitative informations on the frequencies and the dispersion relations. These results are then specialized to crystals of the tetragonal point group for various propagation directions: exact representation for the acoustic and optic frequencies and for the coupled vibrations modes are obtained for propagation directions along the tetragonal c-axis.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/284871

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

Existence, Decay Time and Light Yield for a Reaction-Diffusion-Drift Equation in the Continuum Physics of Scintillators
Harnack Inequalities and Nonlinear Operators. Proceedings of the INdAM conference to celebrate the 70th birthday of Emmanuele DiBenedetto
Autore/i: Davi', F.
Editore: Springer
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A scintillator is a material which converts incoming ionizing energy into visible light. This conversion process, which is a strongly nonlinear one, can be described by a Reaction-Diffusion-Drift equation we obtain from a model of continua with microstructure endowed with a suitable thermodynamics. For such an equation it can be show the global existence of renormalizable and weak solutions, and the solutions exponential decay estimates can be given; moreover we give also a mathematical definition for the light yield which is a measure of scintillation efficiency.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290598

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

A brief overview of existence results and decay time estimates for a mathematical modeling of scintillating crystals
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
Autore/i: Davi', F.
Classificazione: 1 Contributo su Rivista
Abstract: Inorganic scintillating crystals can be modelled as continua with microstructure. For rigid and isothermal crystals the evolution of charge carriers becomes in this way described by a reaction-diffusion-drift equation coupled with the Poisson equation of electrostatic. Here we give a survey of the available existence and asymptotic decays results for the resulting boundary value problem, the latter being a direct estimate of the scintillation decay time.We also show how to recover various approximated models which encompass also the two most used phenomenological models for scintillators, namely the Kinetic and Diffusive ones. Also for these cases we show, whenever it is possible, which existence and asymptotic decays estimate results are known to date.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290710

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

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

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

Some approximate relations in the photoelasticity of strongly-anisotropic crystals
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
Autore/i: Davi', F.
Classificazione: 1 Contributo su Rivista
Abstract: The knowledge of the principal refractive indeces and their dependence on the applied stress are the starting point for any experimental analysis of transparent crys- tals. Since for strongly-anisotropic crystals and general state of stress an explicit analytical solution can be difficult to obtain, then we need some approximated solu- tions. Here we propose a coherent approximation procedure which generalizes results already obtained and give a simple example of application.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/282215

On the generalisation of the Brewster law
MATHEMATICS AND MECHANICS OF COMPLEX SYSTEMS
Autore/i: Davi', F.
Classificazione: 1 Contributo su Rivista
Abstract: In classical photoelasticity of transparent isotropic materials, the Brewster law states that the difference in principal refraction index (birefringence) is propor- tional to the difference in principal stress. Here we show that such a relation can be generalized to anisotropic crystals only for the high-symmetry classes of the cubic group and for a specific plane stress, also for the high-symmetry classes of the trigonal, tetragonal, and hexagonal groups. No further generalizations are possible.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/278093

Scintillating Crystals as Continua with Microstructure
Developments and Novel Approaches in Biomechanics and Metamaterials, in Advanced Structured Materials
Autore/i: Davì, Fabrizio
Editore: Springer Nature Switzerland AG
Luogo di pubblicazione: Cham
Classificazione: 2 Contributo in Volume
Abstract: A scintillator material converts ionizing radiations into visible light. The process, a microscopic one related to the band gap energy in the atoms, is mediated by excited charge carriers which evolve and recombine in photons. Such recombination process evolves at a scale between the microscopic scale and the macroscopic scale of the bulk crystals. Here we show how this evolution process can be modeled with the mechanics of a continua with microstructure. By the means of thermodynamics we arrive at constitutive relations which lead to a reaction-diffusion-drift coupled system. Such a system resembles those already obtained, by starting from a different approach, for semiconductors. The mathematical study of these equations gives an insight about some properties of scintillator crystal which are confirmed by known experimental results.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/283233

Mechanoluminescence in Scintillators
Proceedings of XXIV AIMETA Conference 2019
Autore/i: Davi', Fabrizio
Editore: Springer
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Scintillating materials generate photons when they are hit by radiations and for this reason are used in high-energy physics to detect particle collisions, in medical imaging or in security devices. Scintillation is an example of Radioluminescence: however there are materials which may exhibit Electroluminescence (photon emission when acted by an electric field) or Mechanoluminescence (photon emission by elastic deformation, fracture or scratch). These phenomena, which are cross- correlated affects the photon production and therefore a deeper knowl- edge of them is needed. As we have already done for non-deformable scintillators, we obtain a continuum model for Mechanoluminescence (in the isothermal and elastic case), which allows to descibe from a phenomenological point of view the experimentally-obtained relations between mechanical stress and scintillation efficiency.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/277366

Exact and linearized refractive index stress-dependence in anisotropic photoelastic crystals
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES A
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: For the permittivity tensor of photoelastic anisotropic crystals, we obtain the exact nonlinear dependence on the Cauchy stress tensor. We obtain the same result for its square root, whose principal components, the crystal principal refractive index, are the starting point for any photoelastic analysis of transparent crystals. From these exact results we then obtain, in a totally general manner, the linearized expressions to within higher-order terms in the stress tensor for both the permittivity tensor and its square root. We finish by showing some relevant examples of both nonlinear and linearized relations for optically isotropic, uniaxial and biaxial crystals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/282023

Decay Time Estimates by a Continuum Model for Inorganic Scintillators
CRYSTALS
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: We use the phenomenological continuum model for inorganic scintillators proposed by the author to give decay time estimates for four scintillators previously studied, namely NaI:Tl, CaF2, Gd2SiO5Ce (GSO:Ce), and LaCl3:Ce. We show that, in order to obtain a good estimate of the decay time, we need to know (besides other well-known parameters) either the excitation carriers’ mobility or the structure and the parameters of the recombination mechanism. For these four materials, we know the data for the recombination term, whereas we have very scarce information about mobilities. However, we show that also in absence of experimentally-measured mobilities, with reasonable assumptions about them, we can obtain a good estimate for the slow component of the decay time. We show also when it is appropriate to model scintillation with one of the two most-used phenomenological models, the kinetic and the diffusive. The main point of the present approach is that it requires a limited set of experimentally-measured data and can be hopefully used in conjunction with more sophisticated and detailed models to design faster inorganic scintillators.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262786

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

A Continuum Theory of Scintillation for Inorganic Scintillating Crystals
EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER AND COMPLEX SYSTEMS
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: We obtain, by starting from the balance laws of a continuum endowed with a vectorial microstructure and with a suitable thermodynamics, the evolution equation for the excitation carriers in scintillating crystals. These equations, coupled with the heat and electrostatic equations, describe the non-proportional response of a scintillator to incoming ionizing radiations in terms of a reaction and diffusion-drift system. The system of partial differential equations we arrive at allows for an explicit estimate of the decay time, a result which is obtained here for the first time for scintillators. Moreover, we show how the two most popular phenomenological models in use, namely the kinetic and diffusive models, can be recovered, among many others, as a special case of our model. An example with the available data for NaI:Tl is finally given and discussed, showing how these models depend on the energy of ionizing radiations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262818

Sustainable Engineering for Resilient Built and Natural Environments
The First Outstanding 50 Years of “Università Politecnica delle Marche”
Autore/i: Alici, Antonello; Bocci, Maurizio; Bonvini, Paolo; Brocchini, Maurizio; Calamai, Alessandro; Canestrari, Francesco; Capozucca, Roberto; Carbonari, Alessandro; Carbonari, Sandro; Cardone, Fabrizio; Clementi, Francesco; Clini, Paolo; Cocchi, Giammichele; Corvaro, Sara; Darvini, Giovanna; Davì, Fabrizio; Dezi, Luigino; Di Giuseppe, Elisa; D’Orazio, Marco; Ferretti, Maddalena; Ferrotti, Gilda; Gara, Fabrizio; Giretti, Alberto; Graziani, Andrea; Lancioni, Giovanni; Lemma, Massimo; Lenci, Stefano; Lorenzoni, Carlo; Malinverni, Eva Savina; Mancinelli, Alessandro; Mariano, Fabio; Mentrasti, Lando; Mondaini, Gianluigi; Montecchiari, Piero; Munafò, Placido; Naticchia, Berardo; Postacchini, Matteo; Quagliarini, Enrico; Quattrini, Ramona; Ragni, Laura; Serpilli, Michele; Soldini, Luciano; Virgili, Amedeo; Zampini, Giovanni
Editore: Springer
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/272866

An Overview of the Structural Safety-Oriented Research in the Region Marche Seismic Area
The First Outstanding 50 Years of “Università Politecnica delle Marche”
Autore/i: Capozucca, R.; Carbonari, S.; Clementi, F.; Cocchi, G.; Davi, F.; Dezi, L.; Gara, F.; Lancioni, G.; Lenci, S.; Mentrasti, L.; Ragni, L.; Serpilli, M.
Editore: Springer, Cham
Classificazione: 2 Contributo in Volume
Abstract: In recent years, Italy has been hit by earthquakes, causing significant damage to masonry and reinforced concrete (RC) structures. Especially, common buildings and ordinary structures in many small historical towns of Italian central regions, such as Marche, have suffered dramatic consequences and destruction. Dynamic analysis and seismic structural safety are important topics in civil engineering, which have been studied and deepened for many years by the researchers of the Structural Division of the Department of Civil and Building Engineering, and Architecture of UnivPM. The researches have been oriented towards the investigation of structures under seismic loads in order to improve the knowledge of the structural response under high actions, due to the soil dynamic movements and, thus, define adequate techniques to strengthen the damaged structures. In this paper we present a wide spectrum of main results of our research group, comprising experimental studies, vulnerability analysis and assessment of existing structures, new methods of modelling and theoretical approaches to define the dynamic behavior of structures, also in presence of damage. Finally, we show and discuss new prospects of research for safety, employing advanced techniques and materials to prevent collapse and/or relevant damages in structures.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/281739

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

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

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

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

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

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

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

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

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

On the Bertin Surfaces of Photoelastic Crystals
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: The conoscopic analysis of interference fringes is one of the most useful tools to investigate the mechanical properties of a crystal. These fringes are generated by a surface of constant phase difference called "Bertin surface" whose shape depends on the piezooptic properties of the material and on the applied stress. Here we investigate systematically for the first time these surfaces as algebraic surfaces. We also describe their dependence on the stress when these are "small" and give a detailed analysis for all crystallographic classes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227907

Experimentation on historic timber trusses to identify repair techniques compliant with the original structural–constructive conception
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Munafo', Placido; Stazi, Francesca; Tassi, Camilla; Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: The paper focuses on historic timber trusses to characterize the original failure mode and identify suitable repair techniques. 4 full scale trusses with different spans (6 and 12 m) and assembly modes for the king-post to tie beam connection (close or open node) were submitted to symmetric load carrying test up to failure. For all the assemblies the failure mechanism advantageously occurred for sliding shear in the tie beam toe (the heel) with subsequent structure capability to support additional loads. The king post to tie beam node configuration was found to influence the ultimate load value and the overall structure deformation without changing the original mode of collapse. The most common type of truss (in surveyed Italian areas) was then selected (6m, open node) to test up to failure four different heel repair techniques: screws, bolts, lateral steel plates with screws, internal steel plates with epoxy resin. Only one technique, the one with internal glued plates, enhanced the overall load carrying capacity but proper measures should be taken to avoid the sudden failure of the tie beam end. The introduction of lateral plates with screws restored the original load carrying capacity, improved the node ductility and reduced the upper ridge lowering.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228035

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

Towards a Continuum Theory for Scintillators.
Atti XXI Convegno AIMETA
Autore/i: Davi', Fabrizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A scintillator is a material that exhibits scintillation, the property of luminescence when excited by ionizing radiation. Luminescent materials, when struck by an incoming particle, absorb its energy and scintillate, i.e., re-emit the absorbed energy in the form of light. Scintillators can be organic and inorganic: we deal only with inorganic scintillators, i.e. furnace-growth crystals. For the relevant applications, the crystals are growth and cut in massive specimen, namely of the order of centimeters and there is a need of a description of the behavior of the massive crystal starting from the microscopic description. In this paper we shall begin to give a basic description of scintillation by using a continuum mechanics approach and by means the introduction of balance laws and energy dissipation inequalities for continua with microstructure, as it was done for the Ginzburg-Landau and Cahn-Hillard equations. We limit our analysis to one-dimensional, non-deformable and "isotropic" crystals, and we are able to recover and generalize, within the framework of the theory of continua with microstructure the equations of the so-called "kinetic approach".
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164726

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

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

Singularities in Landau-Devonshire potentials for Ferroelectrics Phase-Transitions
Atti XIX Convegno AIMETA, Ancona 14-17 Settembre 2009
Autore/i: Davi', Fabrizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/45309

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

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

"Le capriate lignee storiche per i tetti a bassa pendenza."
In Atti del Seminario Internazionale "Teoria e pratica del costruire: saperi, strumenti, modelli
Autore/i: Munafo', Placido; Davi', Fabrizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/45371

On twinning and domain switching in ferroelectric PbZr(x)Ti(1-x)O(3). Part I: twins and domain walls.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Autore/i: Davi', Fabrizio; Rizzoni, R.
Classificazione: 1 Contributo su Rivista
Abstract: We study the electromechanical behavior of Lead Zirconate Titanate ferroelectric ceramics (PZT), by means of a three-dimensional continuum model for deformable ferroelectric bodies in their polar phase characterized by spontaneous polarization and strain. Spontaneous polarization and strain organize into a domain structure which minimizes electrostatic and elastic energies and which can be modified by the application of electromechanical loads. Such process, which is called "domain switching", is associated with electrical and mechanical hysteresis and can be studied as a minimization problem for a functional which reminds the micromagnetic energy of deformable ferromagnetics. In this paper, which is the first of two, we deal with the electromechanical model and related constitutive assumptions, as well as with the analysis of domain structure in PZT. In particular, following the discover of a new monoclinic phase in PZT carried by Noheda and co-workers, we analyze twinning between spontaneous strain at the various phase boundaries and show that both non-generic, non-conventional twins and finely-twinned laminates are possible, and also that the presence of a monoclinic phase may explain PZT exceptional properties.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33234

Criteri di progetto di facciate continue in vetro e alluminio in zona sismica.
International Symposium: Involucri Quali Messaggi in Architettura
Autore/i: Rachetta, A.; Quagliarini, Enrico; Davi', Fabrizio; Giacchetti, R.; Stazi, Alessandro
Editore: Luciano Editore
Luogo di pubblicazione: NAPOLI
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50823

Il restauro della materia del costruito nel rispetto del funzionamento meccanico originale: il caso delle capriate lignee
L'EDILIZIA
Autore/i: Munafo', Placido; Davi', Fabrizio; Barcaglioni, V.
Editore: -Milano : De Lettera, 1990- precedente: - Milano: [s.n.].
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31586

Codice genetico di rottura. Il rispetto negli interventi di restauro.
L'EDILIZIA
Autore/i: Munafo', Placido; Davi', Fabrizio; Mugianesi, E.
Editore: -Milano : De Lettera, 1990- precedente: - Milano: [s.n.].
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31587

On electro- and elasto-optically active materials
ATTI XVI Convegno AIMETA
Autore/i: Davi', Fabrizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Articolo completo su CD-ROM
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/45310

The evolution of domain wall in ferroelectric materials
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Autore/i: Davi', Fabrizio; Mariano, P. M.
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32580

On domain switching in deformable ferroelectrics, seen as continua with microstructure
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62569

The static electromechanical coupling factor in linear piezolectricity
JOURNAL OF STRUCTURAL CONTROL
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: We show that the electromechanical coupling factor is the solution of two eigenvalue problems which depends on the piezoelectric, elastic and dielectric properties of the materials. We show that there are at most three eigenvalues and three associated strain eigentensors which render extremum the ratio of mechanical energy converted into electric energy: their value is the same if the three eigenvalues whose associated electric field eigenvectors render extremum the ratio of electrical energy converted into mechanical.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227215

Dynamics of non-linear thin piezoelectric rods with domain switching
Proceedings SPIE, 5th Annual Symposium on Smart Structures and Materials
Autore/i: Davi', Fabrizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We obtain a model for the non-linear electromechanical motion of piezoelectric rod with domain switching. We assume the piezoelectric body as a continuum with a microstructure given by the effective number of switchable aligned dipoles. As in previous related works, by using suitable mechanical internal constraints and electrical semi-inverse hypotheses, we arrive at a one-dimensional functional. With standard variational techniques then we get one-dimensional equations of motion for the non-linear extension and bending of a piezoelectric rod with domain switching.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227218

Thin piezolectric rods with quasi-static domain switching
Proceedings SPIE, 4th Annual Symposium on Smart Structures and Materials
Autore/i: Davi', Fabrizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Following an increasing use of piezoelectric materials to design "smart" sensor-actuator systems, a lot of attention is paid to the modeling of their electromechanical beahviour, as testified in literature by many survey articles and books; however, since most of the applications deal with linear plate-like or rod-like bodies, they consequently embody the same kind of approximate theories that are used in technical mechanics, with further ad-hoc assumptions on the electromechanical coupling. In order to remove these degrees of approximations, we obtained, from the three-dimensional theory a model for the one-dimensional dynamics of linear piezoelectric rods without introducing an "order of magnitude" of kinematical terms which are regarded to be small: this was achieved by using the method of internal constraints, which reflects at a phenomenological level the concept of mechanical thinness of the rod, whereas the electrical thinness was reflected on a semi-inverse assumption on the electric displacement field. Such a simple model for the rod electromechanical motions showed both the relation between electric field and deformation as well as the piezoelectric stiffening effect. Here we wish to get the same results by taking into account the domain switching phenomena: we limit our analysis to the quasi-static case and use in place of the standard Voigt's linear relations, those proposed by P.J. Chen. Once we get from this macroscopic constitutive model and from our hypothesis an expression for the electric and the displacement fields, by using standard variational techniques we arrive at the one-dimensional equations of motion and rate-law.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227217

Dynamics of Linear Piezoelectric Rods
JOURNAL OF ELASTICITY
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62568

Saint-Venant's Problem with Voigt's Hypotheses for Anisotropic Solids
JOURNAL OF ELASTICITY
Autore/i: Davi', Fabrizio; Tiero, A.
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/11566/31638

Saint-Venant's Problem for Linear Piezoelectric Bodies
JOURNAL OF ELASTICITY
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62567

Plane Progressive Waves in constrained anisotropic solids with an application to Kirchhoff plate-like bodies
EUROPEAN JOURNAL OF MECHANICS. A, SOLIDS
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Abstract: In previous papers by Podio-Guidugli and Lembo the equations governing the static and dynamic of Kirchhoff plates were obtained from the three-dimensional linear elasticity under the assumptions that the material was both anisotropic and internally constrained; here we apply the same assumptions to obtain, from three-dimensional elasticity an exact theory of the propagation of plane progressive waves into these plates. In order to get this result we first describe the acoustic tensor for an unconstrained monoclinic material whose symmetry group contains simply the reflections on the middle surface of the plate, then we deal with the propagation condition in an internally constrained anisotropic material. This approach differs from that proposed by Chadwick, because we use the constrained elasticity tensor introduced by Podio-Guidugli and Vianello, 1992, instead of the unconstrained one used therein: such a choice leads to the same propagation condition, but to different reactive stresses. Finally, for Kirchhoff plates, we find the admissible waves together with the corresponding stress and couple resultants and the reflection conditions at the boundary.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227214

Dynamics of Linear Anisotropic Rods
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Autore/i: Davi', Fabrizio
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31642

On the constraint and scaling methods to derive the equation s of linearly elastic thin rods.
MECCANICA
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62553

The Theory of Kirchhoff Rods as an Exact Consequence of Three-dimensional Elasticity
JOURNAL OF ELASTICITY
Autore/i: Davi', Fabrizio
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/11566/32578

On the motion of a phase interface by surface diffusion
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
Autore/i: Davi', Fabrizio; Gurtin, M. E.
Editore: Birkhaeuser Verlag AG:Viaduktstrasse 42-44, CH 4051 Basel Switzerland:011 41 61 2050707, EMAIL: subscriptions@birkhauser.ch, INTERNET: http://www.birkhauser.ch, Fax: 011 41 61 2050792
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32579

Indipendenza dal modulo di Poisson degli stati elastici di una piastra sottile
ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI. RENDICONTI DELLA CLASSE DI SCIENZE FISICHE, MATEMATICHE E NATURALI
Autore/i: Davi', Fabrizio; Sacco, E.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227216

Su una tecnica di simulazione di accelerogrammi
INGEGNERIA SISMICA
Autore/i: Davi', Fabrizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62552