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. Benoı̂t, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, C. Bourgeois, M. Briére, V. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. de Combarieu, I. Dafinei, F.A. Danevich, M. De Jésus, L. Dumoulin, K. Eitel, E. Elkhoury, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, C. Guérard, D. Helis, H. Z. Huang, R.G. Huang, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. Kobychev, Yu.G. Kolomensky, С. И. Коновалов, 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, T. Redon, S. Rozov, C. Rusconi, V. Sanglard, K. Schäffner, B. Schmidt, Yang 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. A. Winslow, M. Xue, E. Yakushev, A. Zolotarova
Abstract
We report the measurement of the two-neutrino double-beta (2νββ) decay of $^{100}$Mo to the ground state of $^{100}$Ru using lithium molybdate (Li$_{2}$$^{100}$MoO$_{4}$) 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 (France). From a total exposure of 42.235 kg×day, the half-life of $^{100}$Mo is determined to be T2ν¦(1/2)=[7.12(+0.18)¦(-0.14) (stat.)±0.10(syst.)]×10$^{18}$ years. This is the most accurate determination of the 2νββ half-life of $^{100}$Mo to date.