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arXiv · 1912.07272

Precise measurement of $2\nu\beta\beta$ decay of $^{100}$Mo with the CUPID-Mo detection technology

E. Armengaud·C. Augier·A. S. Barabash·F. Bellini·G. Benato·A. Benoît·M. Beretta·L. Bergé·J. Billard·Yu. A. Borovlev·Ch. Bourgeois·M. Briere·V. Brudanin·P. Camus·L. Cardani·N. Casali·A. Cazes·M. Chapellier·F. Charlieux·M. de Combarieu·I. Dafinei·F. A. Danevich·M. De Jesus·L. Dumoulin·K. Eitel·E. Elkhoury·F. Ferri·B. K. Fujikawa·J. Gascon·L. Gironi·A. Giuliani·V. D. Grigorieva·M. Gros·E. Guerard·D. L. Helis·H. Z. Huang·R. Huang·J. Johnston·A. Juillard·H. Khalife·M. Kleifges·V. V. Kobychev·Yu. G. Kolomensky·S. I. Konovalov·A. Leder·J. Kotila·P. Loaiza·L. Ma·E. P. Makarov·P. de Marcillac·L. Marini·S. Marnieros·D. Misiak·X-F. Navick·C. Nones·V. Novati·E. Olivieri·J. L. Ouellet·L. Pagnanini·P. Pari·L. Pattavina·B. Paul·M. Pavan·H. Peng·G. Pessina·S. Pirro·D. V. Poda·O. G. Polischuk·E. Previtali·Th. Redon·S. Rozov·C. Rusconi·V. Sanglard·K. Schäffner·B. Schmidt·Y. Shen·V. N. Shlegel·B. Siebenborn·V. Singh·C. Tomei·V. I. Tretyak·V. I. Umatov·L. Vagneron·M. Velázquez·M. Weber·B. Welliver·L. Winslow·M. Xue·E. Yakushev·A. S. Zolotarova
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Abstract

We report the measurement of the two-neutrino double-beta ($2\nu\beta\beta$) decay of $^{100}$Mo to the ground state of $^{100}$Ru using lithium molybdate (\crystal) scintillating bolometers. The detectors were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory. From a total exposure of $42.235$ kg$\times$d, the half-life of $^{100}$Mo is determined to be $T_{1/2}^{2\nu}=[7.12^{+0.18}_{-0.14}\,\mathrm{(stat.)}\pm0.10\,\mathrm{(syst.)}]\times10^{18}$ years. This is the most accurate determination of the $2\nu\beta\beta$ half-life of $^{100}$Mo to date. We also confirm, with the statistical significance of $>3\sigma$, that the single-state dominance model of the $2\nu\beta\beta$ decay of $^{100}$Mo is favored over the high-state dominance model.

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E. Armengaud, C. Augier, A. S. Barabash, F. Bellini, G. Benato, A. Benoît, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, Ch. Bourgeois, M. Briere, V. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. de Combarieu, I. Dafinei, F. A. Danevich, M. De Jesus, L. Dumoulin, K. Eitel, E. Elkhoury, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, E. Guerard, D. L. Helis, H. Z. Huang, R. Huang, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, A. Leder, J. Kotila, P. Loaiza, L. Ma, E. P. Makarov, P. de Marcillac, L. Marini, S. Marnieros, D. Misiak, X-F. Navick, C. Nones, V. Novati, E. Olivieri, J. L. Ouellet, L. Pagnanini, P. Pari, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, E. Previtali, Th. Redon, S. Rozov, C. Rusconi, V. Sanglard, K. Schäffner, B. Schmidt, Y. Shen, V. N. Shlegel, B. Siebenborn, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, M. Weber, B. Welliver, L. Winslow, M. Xue, E. Yakushev, A. S. Zolotarova. 2019-12-16. Precise measurement of $2\nu\beta\beta$ decay of $^{100}$Mo with the CUPID-Mo detection technology. https://doi.org/10.1140/epjc%2Fs10052-020-8203-4

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