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

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 T${}_{1/2}^{2\nu }$ = [7.12${}_{-0.14}^{+0.18}$(stat.) ± 0.10(syst.)] × 10${}^{18}$ years. This is the most accurate determination of the 2νββ half-life of ${}^{100}$Mo to date.