학술논문
The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects
Document Type
article
Author
E. Armengaud; C. Augier; A. S. Barabash; F. Bellini; G. Benato; A. Benoît; M. Beretta; L. Bergé; J. Billard; Yu. A. Borovlev; Ch. Bourgeois; M. Briere; V. B. Brudanin; P. Camus; L. Cardani; N. Casali; A. Cazes; M. Chapellier; F. Charlieux; M. de Combarieu; I. Dafinei; F. A. Danevich; M. De Jesus; L. Dumoulin; K. Eitel; E. Elkhoury; F. Ferri; B. K. Fujikawa; J. Gascon; L. Gironi; A. Giuliani; V. D. Grigorieva; M. Gros; E. Guerard; D. L. Helis; H. Z. Huang; R. Huang; J. Johnston; A. Juillard; H. Khalife; M. Kleifges; V. V. Kobychev; Yu. G. Kolomensky; S. I. Konovalov; A. Leder; P. Loaiza; L. Ma; E. P. Makarov; P. de Marcillac; L. Marini; S. Marnieros; D. Misiak; X. -F. Navick; C. Nones; V. Novati; E. Olivieri; J. L. Ouellet; L. Pagnanini; P. Pari; L. Pattavina; B. Paul; M. Pavan; H. Peng; G. Pessina; S. Pirro; D. V. Poda; O. G. Polischuk; E. Previtali; Th. Redon; S. Rozov; C. Rusconi; V. Sanglard; K. Schäffner; B. Schmidt; Y. Shen; V. N. Shlegel; B. Siebenborn; V. Singh; S. Sorbino; C. Tomei; V. I. Tretyak; V. I. Umatov; L. Vagneron; M. Velázquez; M. Weber; B. Welliver; L. Winslow; M. Xue; E. Yakushev; A. S. Zolotarova
Source
European Physical Journal C: Particles and Fields, Vol 80, Iss 1, Pp 1-15 (2020)
Subject
Language
English
ISSN
1434-6044
1434-6052
1434-6052
Abstract
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.