A1 Journal article (refereed)
Measurement of the 2νββ Decay Rate and Spectral Shape of 100Mo from the CUPID-Mo Experiment (2023)

CUPID-Mo Collaboration. (2023). Measurement of the 2νββ Decay Rate and Spectral Shape of 100Mo from the CUPID-Mo Experiment. Physical Review Letters, 131, Article 162501. https://doi.org/10.1103/PhysRevLett.131.162501

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Publication details

All authors or editorsCUPID-Mo Collaboration

Journal or seriesPhysical Review Letters



Publication year2023

Publication date18/10/2023


Article number162501

PublisherAmerican Physical Society (APS)

Publication countryUnited States

Publication languageEnglish


Publication open accessNot open

Publication channel open access

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/90667

Web address of parallel published publication (pre-print)https://arxiv.org/abs/2307.14086


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.

Keywordsnuclear physicsparticle physics

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Ministry reportingYes

Reporting Year2023

JUFO rating3

Last updated on 2024-03-07 at 01:26