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arXiv · 2307.14086

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

C. Augier·A. S. Barabash·F. Bellini·G. Benato·6 M. Beretta·L. Berge·J. Billard·Yu. A. Borovlev·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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Abstract

Neutrinoless double beta decay ($0νββ$) 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 ($2νββ)$ 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 $^{100}$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 $2νββ$ 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 $ξ_{3,1}=0.45~\pm 0.03~\text{(stat.)} \ \pm 0.05 \ \text{(syst.)}$, 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 $2νββ$ decay.

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C. Augier, A. S. Barabash, F. Bellini, G. Benato, 6 M. Beretta, L. Berge, J. Billard, Yu. A. Borovlev, 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. 2023-07-26. Measurement of the $2νββ$ decay rate and spectral shape of $^{100}$Mo from the CUPID-Mo experiment. https://arxiv.org/abs/2307.14086

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