The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects

Author:

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.,Dafinei I.,Danevich F. A.,De Jesus M.,Dumoulin L.,Eitel K.,Elkhoury E.,Ferri F.,Fujikawa B. K.,Gascon J.,Gironi L.,Giuliani A.ORCID,Grigorieva V. D.,Gros M.,Guerard E.,Helis D. L.,Huang H. Z.,Huang R.,Johnston J.,Juillard A.,Khalife H.,Kleifges M.,Kobychev V. V.,Kolomensky Yu. G.,Konovalov S. I.,Leder A.,Loaiza P.,Ma L.,Makarov E. P.,de Marcillac P.,Marini L.,Marnieros S.,Misiak D.,Navick X. -F.,Nones C.,Novati V.,Olivieri E.,Ouellet J. L.,Pagnanini L.,Pari P.,Pattavina L.,Paul B.,Pavan M.,Peng H.,Pessina G.,Pirro S.,Poda D. V.,Polischuk O. G.,Previtali E.,Redon Th.,Rozov S.,Rusconi C.,Sanglard V.,Schäffner K.,Schmidt B.,Shen Y.,Shlegel V. N.,Siebenborn B.,Singh V.,Sorbino S.,Tomei C.,Tretyak V. I.,Umatov V. I.,Vagneron L.,Velázquez M.,Weber M.,Welliver B.,Winslow L.,Xue M.,Yakushev E.,Zolotarova A. S.

Abstract

AbstractCUPID-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.

Funder

MISTI-France

Embassy of France in the United States

France-Berkeley Fund

National Academy of Science of Ukraina

IDEATE International Associate Laboratory

Russian Science Foundation

US DOE Office of Science

National Science Foundation

Agence Nationale de la Recherche

Publisher

Springer Science and Business Media LLC

Subject

Physics and Astronomy (miscellaneous),Engineering (miscellaneous)

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