Optimization of the first CUPID detector module
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10052_2022_Article_10720.pdf
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Author(s)
Alfonso, K.
Armatol, A.
Augier, C.
Avignone, F. T.
Azzolini, O.
Balata, M.
Barabash, A. S.
Bari, G.
Barresi, A.
Baudin, D.
Date Issued
September 12, 2022
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2022 Sep 12;82(9):810
Version
Final published version
Abstract
Abstract
CUPID will be a next generation experiment searching for the neutrinoless double
$$\beta $$
β
decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNGS, CUPID aims to reach a background free environment by means of scintillating Li
$$_{2}$$
2
$$^{100}$$
100
MoO
$$_4$$
4
crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of
$$\alpha $$
α
particles, as proven by the CUPID-0 and CUPID-Mo demonstrators. In this work we present the results of the first test of the CUPID baseline module. In particular, we propose a new optimized detector structure and light sensors design to enhance the engineering and the light collection, respectively. We characterized the heat detectors, achieving an energy resolution of (5.9 ± 0.2) keV FWHM at the Q-value of
$$^{100}$$
100
Mo (about 3034 keV). We studied the light collection of the baseline CUPID design with respect to an alternative configuration which features gravity-assisted light detectors’ mounting. In both cases we obtained an improvement in the light collection with respect to past measures and we validated the particle identification capability of the detector, which ensures an
$$\alpha $$
α
particle rejection higher than 99.9%, fully satisfying the requirements for CUPID.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-022-10720-3
