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Twelve-crystal prototype of Li2MoO4 scintillating bolometers for CUPID and CROSS experiments
K. Alfonso1, A. Armatol2, C. Augier3, F.T. Avignone III4, O. Azzolini5, M. Balata6, I.C. Bandac7, A.S. Barabash8, G. Bari9, A. Barresi10,11, D. Baudin2, F. Bellini12,13, G. Benato6, V. Berest2, M. Beretta14, M. Bettelli15, M. Biassoni10, J. Billard3, V. Boldrini9,15, A. Branca10,11, C. Brofferio10,11, C. Bucci6, J.M. Calvo-Mozota7,16, J. Camilleri1, A. Campani17,18, C. Capelli19, S. Capelli10,11, L. Cappelli6, L. Cardani12, P. Carniti10,11, N. Casali12, E. Celi6,20, C. Chang21, D. Chiesa10,11, M. Clemenza10, I. Colantoni12,22, S. Copello17,18, E. Craft23, O. Cremonesi10, R.J. Creswick4, A. Cruciani12, A. D'Addabbo6, G. D'Imperio12, S. Dabagov24, I. Dafinei12, F.A. Danevich25,26, M. De Jesus3, P. de Marcillac27, S. Dell'Oro10,11, S. Di Domizio17,18, S. Di Lorenzo6, T. Dixon27, V. Dompé12,13, A. Drobizhev19, L. Dumoulin27, G. Fantini12,13, M. Faverzani10,11, E. Ferri10, F. Ferri2, F. Ferroni28,20, E. Figueroa-Feliciano29, L. Foggetta24, J. Formaggio30, A. Franceschi24, C. Fu31, S. Fu31,6, B.K. Fujikawa19, A. Gallas27, J. Gascon3, S. Ghislandi6,20, A. Giachero10,11, A. Gianvecchio10,11, M. Girola10,11, L. Gironi10,11, A. Giuliani27, P. Gorla6, C. Gotti10, C. Grant32, P. Gras2, P.V. Guillaumon6, T.D. Gutierrez33, K. Han34, E.V. Hansen14, K.M. Heeger23, D.L. Helis6,20, H.Z. Huang35,31, A. Ianni6, L. Imbert27, J. Johnston30, A. Juillard3, G. Karapetrov36, G. Keppel5, H. Khalife2, V.V. Kobychev25, Yu.G. Kolomensky14,19, S.I. Konovalov8, R. Kowalski37, T. Langford23, M. Lefevre2, R. Liu23, Y. Liu38, P. Loaiza27, L. Ma31, M. Madhukuttan27, F. Mancarella9,15, C.A. Marrache-Kikuchi27, L. Marini6,20, S. Marnieros27, M. Martinez39,40, R.H. Maruyama23, Ph. Mas2, D. Mayer30, G. Mazzitelli24, Y. Mei19, S. Milana12, S. Morganti12, T. Napolitano24, M. Nastasi10,11, J. Nikkel23, S. Nisi6, C. Nones2, E.B. Norman14, V. Novosad21, I. Nutini10,11, T. O'Donnell1, E. Olivieri27, M. Olmi6, J.L. Ouellet30, S. Pagan23, C. Pagliarone6, L. Pagnanini6,20, L. Pattavina6, M. Pavan10,11, H. Peng41, G. Pessina10, V. Pettinacci12, C. Pira5, S. Pirro6, D.V. Poda27, O.G. Polischuk25,12, I. Ponce23, S. Pozzi10,11, E. Previtali10,11, A. Puiu6,20, S. Quitadamo20,6, A. Ressa12,13, R. Rizzoli15,9, C. Rosenfeld4, P. Rosier27, J.A. Scarpaci27, B. Schmidt2, V. Sharma1, V.N. Shlegel42, V. Singh14, M. Sisti10, P. Slocum23, D. Speller37, P.T. Surukuchi23, L. Taffarello43, C. Tomei12, J.A. Torres23, V.I. Tretyak25,6, A. Tsymbaliuk5, M. Velazquez44, K.J. Vetter14, S.L. Wagaarachchi14, G. Wang21, L. Wang38, R. Wang37, B. Welliver14,19, J. Wilson4, K. Wilson4, L.A. Winslow30, M. Xue41, L. Yan31, J. Yang41, V. Yefremenko21, V.I. Umatov8, M.M. Zarytskyy25, J. Zhang21, A. Zolotarova2, S. Zucchelli9,45, CUPID collaboration
and CROSS collaboration
An array of twelve 0.28 kg lithium molybdate (LMO)
low-temperature bolometers equipped with 16 bolometric Ge light
detectors, aiming at optimization of detector structure for CROSS
and CUPID double-beta decay experiments, was constructed and tested
in a low-background pulse-tube-based cryostat at the Canfranc
underground laboratory in Spain. Performance of the scintillating
bolometers was studied depending on the size of phonon NTD-Ge
sensors glued to both LMO and Ge absorbers, shape of the Ge light
detectors (circular vs. square, from two suppliers), in different
light collection conditions (with and without reflector, with
aluminum coated LMO crystal surface). The scintillating bolometer
array was operated over 8 months in the low-background conditions
that allowed to probe a very low, μBq/kg, level of the LMO
crystals radioactive contamination by 228Th and 226Ra.
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