학술논문
Optimization of the first CUPID detector module
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article
Author
collaboration, CUPID; Armatol, A; Augier, C; III, FT Avignone; Azzolini, O; Balata, M; Ballen, K; Barabash, AS; Bari, G; Barresi, A; Baudin, D; Bellini, F; Benato, G; Beretta, M; Bettelli, M; Biassoni, M; Billard, J; Boldrini, V; Branca, A; Brofferio, C; Bucci, C; Camilleri, J; Capelli, C; Capelli, S; Cappelli, L; Cardani, L; Carniti, P; Casali, N; Celi, E; Chang, C; Chiesa, D; Clemenza, M; Colantoni, I; Copello, S; Craft, E; Cremonesi, O; Creswick, RJ; Cruciani, A; D'Addabbo, A; D'Imperio, G; Dabagov, S; Dafinei, I; Danevich, FA; Jesus, M De; Marcillac, P de; Dell'Oro, S; Domizio, S Di; Lorenzo, S Di; Dixon, T; Dompè, V; Drobizhev, A; Dumoulin, L; Fantini, G; Faverzani, M; Ferri, E; Ferri, F; Ferroni, F; Figueroa-Feliciano, E; Foggetta, L; Formaggio, J; Franceschi, A; Fu, C; Fu, S; Fujikawa, BK; Gallas, A; Gascon, J; Ghislandi, S; Giachero, A; Gianvecchio, A; Gironi, L; Giuliani, A; Gorla, P; Gotti, C; Grant, C; Gras, P; Guillaumon, PV; Gutierrez, TD; Han, K; Hansen, EV; Heeger, KM; Helis, DL; Huang, HZ; Huang, RG; Imbert, L; Johnston, J; Juillard, A; Karapetrov, G; Keppel, G; Khalife, H; Kobychev, VV; Kolomensky, Yu G; Konovalov, SI; Kowalski, R; Langford, T; Lefevre, M; Liu, R; Liu, Y; Loaiza, P; Ma, L; Madhukuttan, M
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Abstract
CUPID will be a next generation experiment searching for the neutrinolessdouble $\beta$ decay, whose discovery would establish the Majorana nature ofthe neutrino. Based on the experience achieved with the CUORE experiment,presently taking data at LNGS, CUPID aims to reach a background freeenvironment by means of scintillating Li$_{2}$$^{100}$MoO$_4$ crystals coupledto light detectors. Indeed, the simultaneous heat and light detection allows usto reject the dominant background of $\alpha$ particles, as proven by theCUPID-0 and CUPID-Mo demonstrators. In this work we present the results of thefirst test of the CUPID baseline module. In particular, we propose a newoptimized detector structure and light sensors design to enhance theengineering and the light collection, respectively. We characterized the heatdetectors, achieving an energy resolution of (5.9 $\pm$ 0.2) keV FWHM at the$Q$-value of $^{100}$Mo (about 3034 keV). We studied the light collection ofthe baseline CUPID design with respect to an alternative configuration whichfeatures gravity-assisted light detectors' mounting. In both cases we obtainedan improvement in the light collection with respect to past measures and wevalidated the particle identification capability of the detector, which ensuresan $\alpha$ particle rejection higher than 99.9%, fully satisfying therequirements for CUPID.