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

Author(s): Armengaud, E; Augier, C; Barabash, AS; Bellini, F; Benato, G; Benoit, A; Beretta, M; Berge, L; Billard, J; Borovlev, YA; Bourgeois, C; Briere, M; Brudanin, V; Camus, P; Cardani, L; Casali, N; Cazes, A; Chapellier, M; Charlieux, F; de Combarieu, M; Dafinei, I; Danevich, FA; De Jesus, M; Dumoulin, L; Eitel, K; Elkhoury, E; Ferri, F; Fujikawa, BK; Gascon, J; Gironi, L; Giuliani, A; Grigorieva, VD; Gros, M; Guerard, E; Helis, DL; Huang, HZ; Huang, R; Johnston, J; Juillard, A; Khalife, H; Kleifges, M; Kobychev, VV; Kolomensky, YG; Konovalov, SI; Leder, A; Kotila, J; Loaiza, P; Ma, L; Makarov, EP; de Marcillac, P; Marini, L; Marnieros, S; Misiak, D; Navick, XF; Nones, C; Novati, V; Olivieri, E; Ouellet, JL; Pagnanini, L; Pari, P; Pattavina, L; Paul, B; Pavan, M; Peng, H; Pessina, G; Pirro, S; Poda, DV; Polischuk, OG; Previtali, E; Redon, T; Rozov, S; Rusconi, C; Sanglard, V; Schaffner, K; Schmidt, B; Shen, Y; Shlegel, VN; Siebenborn, B; Singh, V; Tomei, C; Tretyak, VI; Umatov, VI; Vagneron, L; Velazquez, M; Weber, M | Abstract: © 2020, The Author(s). We report the measurement of the two-neutrino double-beta (2 νββ) decay of 100Mo to the ground state of 100Ru using lithium molybdate (Li2100MoO4) 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 100Mo is determined to be T1/22ν=[7.12-0.14+0.18(stat.)±0.10(syst.)]×1018 years. This is the most accurate determination of the 2 νββ half-life of 100Mo to date.