arXiv · 2011.13806
A CUPID Li$_{2}$$^{100}$MoO$_4$ scintillating bolometer tested in the CROSS underground facility
Abstract
A scintillating bolometer based on a large cubic Li$_{2}$$^{100}$MoO$_4$ crystal (45 mm side) and a Ge wafer (scintillation detector) has been operated in the CROSS cryogenic facility at the Canfranc underground laboratory in Spain. The dual-readout detector is a prototype of the technology that will be used in the next-generation $0\nu2\beta$ experiment CUPID. The measurements were performed at 18 and 12 mK temperature in a pulse tube dilution refrigerator. This setup utilizes the same technology as the CUORE cryostat that will host CUPID and so represents an accurate estimation of the expected performance. The Li$_{2}$$^{100}$MoO$_4$ bolometer shows a high energy resolution of 6 keV FWHM at the 2615 keV $\gamma$ line. The detection of scintillation light for each event triggered by the Li$_{2}$$^{100}$MoO$_4$ bolometer allowed for a full separation ($\sim$8$\sigma$) between $\gamma$($\beta$) and $\alpha$ events above 2 MeV. The Li$_{2}$$^{100}$MoO$_4$ crystal also shows a high internal radiopurity with $^{228}$Th and $^{226}$Ra activities of less than 3 and 8 $\mu$Bq/kg, respectively. Taking also into account the advantage of a more compact and massive detector array, which can be made of cubic-shaped crystals (compared to the cylindrical ones), this test demonstrates the great potential of cubic Li$_{2}$$^{100}$MoO$_4$ scintillating bolometers for high-sensitivity searches for the $^{100}$Mo $0\nu2\beta$ decay in CROSS and CUPID projects.
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The CUPID Interest Group, A. Armatol, E. Armengaud, W. Armstrong, C. Augier, F. T. Avignone III, O. Azzolini, I. C. Bandac, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, M. Beretta, L. Bergé, Ch. Bourgeois, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci, J. M. Calvo-Mozota, J. Camilleri, A. Candela, S. Capelli, L. Cappelli, L. Cardani, P. Carniti, N. Casali, A. Cazes, E. Celi, C. Chang, M. Chapellier, A. Charrier, D. Chiesa, M. Clemenza, I. Colantoni, F. Collamati, S. Copello, F. Cova, O. Cremonesi, R. J. Creswick, A. Cruciani, A. D'Addabbo, G. D'Imperio, I. Dafinei, F. A. Danevich, M. de Combarieu, M. De Deo, M. De Jesus, P. de Marcillac, S. Dell'Oro, S. Di Domizio, V. Dompe, A. Drobizhev, L. Dumoulin, G. Fantini, M. Fasoli, M. Faverzani, E. Ferri, F. Ferri, F. Ferroni, E. Figueroa-Feliciano, J. Formaggio, A. Franceschi, C. Fu, S. Fu, B. K. Fujikawa, J. Gascon, A. Giachero, L. Gironi, A. Giuliani, P. Gorla, C. Gotti, P. Gras, M. Gros, E. Guerard, T. D. Gutierrez, K. Han, E. V. Hansen, K. M. Heeger, D. L. Helis, H. Z. Huang, R. G. Huang, A. Ianni, L. Imbert, J. Johnston, A. Juillard, G. Karapetrov, G. Keppel, H. Khalife, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, Y. Liu, P. Loaiza, L. Ma, M. Madhukuttan. 2020-11-27. A CUPID Li$_{2}$$^{100}$MoO$_4$ scintillating bolometer tested in the CROSS underground facility. https://doi.org/10.1088/1748-0221/16/02/p02037
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