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Measurement of the $2\nu\beta\beta$ decay rate and spectral shape of $^{100}$Mo from the CUPID-Mo experiment

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arxiv 2307.14086 v1 pith:NUHUS24K submitted 2023-07-26 nucl-ex hep-ex

C. Augier , A. S. Barabash , F. Bellini , G. Benato , 6 M. Beretta , L. Berge , J. Billard , Yu. A. Borovlev
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L. Cardani N. Casali A. Cazes E. Celi M. Chapellier D. Chiesa I. Dafinei F. A. Danevich M. De Jesus T. Dixon L. Dumoulin K. Eitel F. Ferri B. K. Fujikawa J. Gascon L. Gironi A. Giuliani V. D. Grigorieva M. Gros D. L. Helis H. Z. Huang R. Huang L. Imbert J. Johnston A. Juillard H. Khalife M. Kleifges V. V. Kobychev Yu. G. Kolomensky S.I. Konovalov J. Kotila P. Loaiza L. Ma E. P. Makarov P. de Marcillac R. Mariam L. Marini S. Marnieros X.-F. Navick C. Nones E. B. Norman E. Olivieri J. L. Ouellet L. Pagnanini L. Pattavina B. Paul M. Pavan H. Peng G. Pessina S. Pirro D. V. Poda O. G. Polischuk S. Pozzi E. Previtali Th. Redon A. Rojas S. Rozov V. Sanglard J. A. Scarpaci B. Schmidt Y. Shen V. N. Shlegel F. Simkovic V. Singh C. Tomei V. I. Tretyak V. I. Umatov L. Vagneron M. Velazquez B. Ware B. Welliver L. Winslow M. Xue E. Yakushev M. Zarytskyy A. S. Zolotarova
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classification nucl-exhep-ex
keywords betadecaymeasurementshapetextnuclearspectralcupid-mo
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Neutrinoless double beta decay ($0\nu\beta\beta$) is a yet unobserved nuclear process which would demonstrate Lepton Number violation, a clear evidence of beyond Standard Model physics. The process two neutrino double beta decay ($2\nu\beta\beta)$ is allowed by the Standard Model and has been measured in numerous experiments. In this letter, we report a measurement of $2\nu\beta\beta$ decay half-life of $^{100}$Mo to the ground state of $^{100}$Ru of $(7.07~\pm~0.02~\text{(stat.)}~\pm~0.11~\text{(syst.)})~\times~10^{18}$~yr by the CUPID-Mo experiment. With a relative precision of $\pm~1.6$ \% this is the most precise measurement to date of a $2\nu\beta\beta$ decay rate in $^{100}$Mo. 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 $\xi_{3,1}=0.45~\pm 0.03~\text{(stat.)} \ \pm 0.05 \ \text{(syst.)}$, which 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 $2\nu\beta\beta$ decay.

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Cited by 2 Pith papers

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  1. Sensitivity of neutrinoless double beta decays from a combined analysis of ground and excited states

    hep-ph 2025-08 unverdicted novelty 5.0 of 10

    Combined analysis of 0νββ decays to ground and excited states can significantly enhance experimental sensitivity depending on NME predictions.

  2. Sensitivity of neutrinoless double beta decays from a combined analysis of ground and excited states

    hep-ph 2025-08 unverdicted novelty 5.0 of 10

    A multi-channel analysis of ground and excited state 0νββ transitions could enhance the discovery potential of next-generation liquid xenon experiments.

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