Abstract: Neutrinoless double beta decay (0νββ) is a yet unobserved nuclear process that would demonstrate Lepton number violation, a clear evidence of beyond standard model physics. The process two neutrino double beta decay (2νββ) is allowed by the standard model and has been measured in numerous experiments. In this Letter, we report a measurement of 2νββ decay half-life of 100Mo to the ground state of 100Ru of [7.07±0.02(stat)±0.11(syst)]×1018  yr by the CUPID-Mo experiment. With a relative precision of ±1.6% this is the most precise measurement to date of a 2νββ decay rate in 100Mo. In addition, we constrain higher-order corrections to the spectral shape, which provides complementary nuclear structure information. We report a novel measurement of the shape factor ξ3,1=0.45±0.03(stat)±0.05(syst) based on a constraint on the ratio of higher-order terms from theory, which can be reliably calculated. This is compared to theoretical predictions for different nuclear models. We also extract the first value for the effective axial vector coupling constant obtained from a spectral shape study of 2νββ decay.

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.
Measurement of the 2νββ Decay Rate and Spectral Shape of 100Mo from the CUPID-Mo Experiment
Physical Review Letters. 2023. V.131. 162501 :1-7. DOI: 10.1103/PhysRevLett.131.162501 WOS Scopus РИНЦ OpenAlex

Dates:

Published print:	Oct 18, 2023
Published online:	Oct 18, 2023

Identifiers:

Web of science:	WOS:001102983000005
Scopus:	2-s2.0-85176350003
Elibrary:	63774160
OpenAlex:	W4387743644

Citing:

DB	Citing
OpenAlex	10
Web of science	3
Scopus	8

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