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A New Approach to Calorimetry in Space-Based Experiments for High-Energy Cosmic Rays

INFN Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
Dipartimento di Scienze Fisiche, della Terra e dell’Ambiente, Università di Siena, Strada Laterina 8, I-53100 Siena, Italy
Dipartimento di Fisica e Astronomia, Università di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino (Firenze), Italy
INFN Firenze, via B. Rossi 1, I-50019 Sesto Fiorentino (Firenze), Italy
Dipartimento di Fisica e Astronomia, Università di Catania, via S. Sofia 74, I-95123 Catania, Italy
INFN Catania, via S. Sofia 64, I-95123 Catania, Italy
INFN Perugia, via A. Pascoli, I-06100 Perugia, Italy
Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali Universita’ di Messina, sal. Sperone 31, I-98121 Messina, Italy
INFN Trieste, via Valerio 2, I-34127 Trieste, Italy
INFN Pavia, via A. Bassi 6, I-27100 Pavia, Italy
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via Cozzi 55, I-20125 Milano, Italy
INFN Milano-Bicocca, Piazza della Scienza, 3-20154 Milano, Italy
Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, Via Vetoio, Coppito, 67100 L’Aquila, Italy
IFAC (CNR), via Madonna del Piano 10, I-50019 Sesto Fiorentino (Firenze), Italy
CNR IMM Catania, Ottava strada, 5-95121 Catania, Italy
Dipartimento di Fisica e Geologia, Università di Perugia, via A. Pascoli, I-06100 Perugia, Italy
Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, sal. Sperone 31, I-98166 Messina, Italy
Author to whom correspondence should be addressed.
This paper is based on the talk at the 7th International Conference on New Frontiers in Physics (ICNFP 2018), Crete, Greece, 4–12 July 2018.
Universe 2019, 5(3), 72;
Received: 28 November 2018 / Revised: 3 February 2019 / Accepted: 4 February 2019 / Published: 7 March 2019
Precise measurements of the energy spectra and of the composition of cosmic rays in the PeV region could improve our knowledge regarding their origin, acceleration mechanism, propagation, and composition. At the present time, spectral measurements in this region are mainly derived from data collected by ground-based detectors, because of the very low particle rates at these energies. Unfortunately, these results are affected by the high uncertainties typical of indirect measurements, which depend on the complicated modeling of the interaction of the primary particle with the atmosphere. A space experiment dedicated to measurements in this energy region has to achieve a balance between the requirements of lightness and compactness, with that of a large acceptance to cope with the low particle rates. CaloCube is a four-year-old R&D project, approved and financed by the Istituto Nazionale di Fisica Nucleare (INFN) in 2014, aiming to optimize the design of a space-borne calorimeter. The large acceptance needed is obtained by maximizing the number of entrance windows, while thanks to its homogeneity and high segmentation this new detector achieves an excellent energy resolution and an enhanced separation power between hadrons and electrons. In order to optimize detector performances with respect to the total mass of the apparatus, comparative studies on different scintillating materials, different sizes of crystals, and different spacings among them have been performed making use of MonteCarlo simulations. In parallel to simulations studies, several prototypes instrumented with CsI(Tl) (Caesium Iodide, Tallium doped) cubic crystals have been constructed and tested with particle beams. Moreover, the last development of CaloCube, the Tracker-In-Calorimeter (TIC) project, financed by the INFN in 2018, is focused on the feasibility of including several silicon layers at different depths in the calorimeter in order to reconstruct the particle direction. In fact, an important requirement for γ -ray astronomy is to have a good angular resolution in order to allow precise identification of astrophysical sources in space. In respect to the traditional approach of using a tracker with passive material in front of the calorimeter, the TIC solution can save a significant amount of mass budget in a space satellite experiment, which can then be exploited to improve the acceptance and the resolution of the calorimeter. In this paper, the status of the project and perspectives for future developments are presented. View Full-Text
Keywords: cosmic rays; astroparticles; γ -ray astronomy cosmic rays; astroparticles; γ -ray astronomy
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Bigongiari, G.; Adriani, O.; Albergo, S.; Ambrosi, G.; Auditore, L.; Basti, A.; Berti, E.; Bonechi, L.; Bonechi, S.; Bongi, M.; Bonvicini, V.; Bottai, S.; Brogi, P.; Cappello, G.; Cattaneo, P.W.; D’Alessandro, R.; Detti, S.; Duranti, M.; Fasoli, M.; Finetti, N.; Formato, V.; Ionica, M.; Italiano, A.; Lenzi, P.; Maestro, P.; Marrocchesi, P.S.; Mori, N.; Orzan, G.; Olmi, M.; Pacini, L.; Papini, P.; Pellegriti, M.G.; Rappoldi, A.; Ricciarini, S.B.; Sciuto, A.; Silvestre, G.; Starodubtsev, O.; Stolzi, F.; Suh, J.E.; Sulaj, A.; Tiberio, A.; Tricomi, A.; Trifirò, A.; Trimarchi, M.; Vannuccini, E.; Vedda, A.; Zampa, G.; Zampa, N. A New Approach to Calorimetry in Space-Based Experiments for High-Energy Cosmic Rays. Universe 2019, 5, 72.

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