Abstract: The CUPID-Mo experiment, located at the Laboratoire Souterrain de Modane (France), was a demonstrator experiment for CUPID. It consisted of an array of 20Li2100MoO4 (LMO) calorimeters, each equipped with a Ge light detector for particle identification. In this work, we present the result of a search for two-neutrino and neutrinoless double-β decays of 100Mo to the first 0+ and 2+ excited states of 100Ru using the full CUPID-Mo exposure (2.71kgyr of LMO). We measure the half-life of 2νββ decay to the 0+1 state as T2ν→0+11/2=(7.5±0.8(stat.)+0.4−0.3(syst.))×1020yr. The bolometric technique enables measurement of the electron energies as well as the γ rays from nuclear deexcitation and this allows us to set new limits on the two-neutrino decay to the 2+1 state of T2ν→2+11/2>4.4×1021yr(90% c.i.) and on the neutrinoless modes of T0ν→2+11/2>2.1×1023yr(90% c.i.), T0ν→0+11/2>1.2×1023yr(90% c.i.). Information on the electrons' spectral shape is obtained, which allows us to make the first comparison of the single and higher state dominance 2νββ decay models for the 0+1 excited state of 100Ru.

Cite: Augier C. , Barabash A.S. , Bellini F. , Benato G. , Beretta M. , Berge L. , Borovlev Y.A. , Grigorieva V.D. , Makarov E.P. , Shlegel V.N. , Zolotarova A.S.
New measurement of double-β decays of 100Mo to excited states of 100Ru with the CUPID-Mo experiment
Physical Review C. 2023. V.107. 025503 :1-20. DOI: 10.1103/PhysRevC.107.025503 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Aug 1, 2022
Accepted:	Dec 2, 2022
Published print:	Feb 2, 2023
Published online:	Feb 2, 2023

Identifiers:

Web of science:	WOS:000951103500002
Scopus:	2-s2.0-85149640698
Elibrary:	60833091
OpenAlex:	W4322626369

Citing:

DB	Citing
OpenAlex	12
Web of science	9
Scopus	8

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