학술논문
New measurement of double-β decays of Mo100 to excited states of Ru100 with the CUPID-Mo experiment
Document Type
article
Author
Augier, C; Barabash, AS; Bellini, F; Benato, G; Beretta, M; Bergé, L; Billard, J; Borovlev, Yu A; Cardani, L; Casali, N; Cazes, A; Chapellier, M; Chiesa, D; Dafinei, I; Danevich, FA; De Jesus, M; Dixon, T; Dumoulin, L; Eitel, K; Ferri, F; Fujikawa, BK; Gascon, J; Gironi, L; Giuliani, A; Grigorieva, VD; Gros, M; Helis, DL; Huang, HZ; Huang, R; Imbert, L; Johnston, J; Juillard, A; Khalife, H; Kleifges, M; Kobychev, VV; Kolomensky, Yu G; Konovalov, SI; Kotila, J; Loaiza, P; Ma, L; Makarov, EP; de Marcillac, P; Mariam, R; Marini, L; Marnieros, S; Navick, X-F; Nones, C; Norman, EB; Olivieri, E; Ouellet, JL; Pagnanini, L; Pattavina, L; Paul, B; Pavan, M; Peng, H; Pessina, G; Pirro, S; Poda, DV; Polischuk, OG; Pozzi, S; Previtali, E; Redon, Th; Rojas, A; Rozov, S; Sanglard, V; Scarpaci, JA; Schmidt, B; Shen, Y; Shlegel, VN; Singh, V; Tomei, C; Tretyak, VI; Umatov, VI; Vagneron, L; Velázquez, M; Welliver, B; Winslow, L; Xue, M; Yakushev, E; Zarytskyy, M; Zolotarova, AS
Source
Physical Review C. 107(2)
Subject
Language
Abstract
The CUPID-Mo experiment, located at the Laboratoire Souterrain de Modane (France), was a demonstrator experiment for CUPID. It consisted of an array of 20Li2Mo100O4 (LMO) calorimeters, each equipped with a Ge light detector for particle identification. In this work, we present the result of a search for two-neutrino and neutrinoless double-β decays of Mo100 to the first 0+ and 2+ excited states of Ru100 using the full CUPID-Mo exposure (2.71kgyr of LMO). We measure the half-life of 2νββ decay to the 01+ state as T1/22ν→01+=(7.5±0.8(stat.)-0.3+0.4(syst.))×1020yr. The bolometric technique enables measurement of the electron energies as well as the γ rays from nuclear deexcitation and this allows us to set new limits on the two-neutrino decay to the 21+ state of T1/22ν→21+>4.4×1021yr(90% c.i.) and on the neutrinoless modes of T1/20ν→21+>2.1×1023yr(90% c.i.), T1/20ν→01+>1.2×1023yr(90% c.i.). Information on the electrons' spectral shape is obtained, which allows us to make the first comparison of the single and higher state dominance 2νββ decay models for the 01+ excited state of Ru100.