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.

Alfonso, K., Armatol, A., Augier, C., Avignone, F., Azzolini, O., Balata, M., et al. (2023). Twelve-crystal prototype of Li_2MoO_4 scintillating bolometers for CUPID and CROSS experiments. JOURNAL OF INSTRUMENTATION, 18(6) [10.1088/1748-0221/18/06/P06018].

Twelve-crystal prototype of Li_2MoO_4 scintillating bolometers for CUPID and CROSS experiments

Barresi, A.;Beretta, M.;Biassoni, M.;Branca, A.;Brofferio, C.;Capelli, S.;Carniti, P.;Chiesa, D.;Clemenza, M.;Cremonesi, O.;Dell'Oro, S.;Faverzani, M.;Ferri, E.;Giachero, A.;Gianvecchio, A.;Girola, M.;Gironi, L.;Gotti, C.;Nastasi, M.;Nutini, I.;Pattavina, L.;Pavan, M.;Pessina, G.;Pozzi, S.;Previtali, E.;Puiu, A.;Sisti, M.;
2023

Abstract

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.
Articolo in rivista - Articolo scientifico
Cryogenic detectors; Double-beta decay detectors; Particle identification methods; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators);
English
20-giu-2023
2023
18
6
P06018
open
Alfonso, K., Armatol, A., Augier, C., Avignone, F., Azzolini, O., Balata, M., et al. (2023). Twelve-crystal prototype of Li_2MoO_4 scintillating bolometers for CUPID and CROSS experiments. JOURNAL OF INSTRUMENTATION, 18(6) [10.1088/1748-0221/18/06/P06018].
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