The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects
Author(s)
Armengaud, E.; Augier, C.; Barabash, A. S; Bellini, F.; Benato, G.; Benoît, A.; Beretta, M.; Bergé, L.; Billard, J.; Borovlev, Yu. A; Bourgeois, Ch.; Briere, M.; Brudanin, V. B; Camus, P.; Cardani, L.; Casali, N.; Cazes, A.; Chapellier, M.; Charlieux, F.; de Combarieu, M.; ... Show more Show less
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Abstract
CUPID-Mo is a bolometric experiment to search for neutrinoless double-beta decay ($$0\nu \beta \beta $$0νββ) of $$^{100}\hbox {Mo}$$100Mo. In this article, we detail the CUPID-Mo detector concept, assembly and installation in the Modane underground laboratory, providing results from the first datasets. The CUPID-Mo detector consists of an array of 20 $$^{100}\hbox {Mo}$$100Mo-enriched 0.2 kg $$\hbox {Li}_2\hbox {MoO}_4$$Li2MoO4 crystals operated as scintillating bolometers at $$\sim 20\hbox { mK}$$∼20mK. The $$\hbox {Li}_2\hbox {MoO}_4$$Li2MoO4 crystals are complemented by 20 thin Ge optical bolometers to reject $$\alpha $$α events by the simultaneous detection of heat and scintillation light. We observe a good detector uniformity and an excellent energy resolution of 5.3 keV (6.5 keV) FWHM at 2615 keV, in calibration (physics) data. Light collection ensures the rejection of $$\alpha $$α particles at a level much higher than 99.9% – with equally high acceptance for $$\gamma $$γ/$$\beta $$β events – in the region of interest for $$^{100}\hbox {Mo}$$100Mo $$0\nu \beta \beta $$0νββ. We present limits on the crystals’ radiopurity: $$\le 3~\mu \hbox {Bq/kg}$$≤3μBq/kg of $$^{226}\hbox {Ra}$$226Ra and $$\le 2~\mu \hbox {Bq/kg}$$≤2μBq/kg of $$^{232}\hbox {Th}$$232Th. We discuss the science reach of CUPID-Mo, which can set the most stringent half-life limit on the $$^{100}\hbox {Mo}$$100Mo $$0\nu \beta \beta $$0νββ decay in half-a-year’s livetime. The achieved results show that CUPID-Mo is a successful demonstrator of the technology developed by the LUMINEU project and subsequently selected for the CUPID experiment, a proposed follow-up of CUORE, the currently running first tonne-scale bolometric $$0\nu \beta \beta $$0νββ experiment.
Date issued
2020-01-18Department
Massachusetts Institute of Technology. Department of PhysicsPublisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2020 Jan 18;80(1):44
Version: Final published version