학술논문
Final results on the $0νββ$ decay half-life limit of $^{100}$Mo from the CUPID-Mo experiment
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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; Jesus, M De; Marcillac, P de; 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; Loaiza, P; Ma, L; Makarov, EP; 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
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Abstract
The CUPID-Mo experiment to search for 0$u\beta\beta$ decay in $^{100}$Mohas been recently completed after about 1.5 years of operation at LaboratoireSouterrain de Modane (France). It served as a demonstrator for CUPID, a nextgeneration 0$u\beta\beta$ decay experiment. CUPID-Mo was comprised of 20enriched Li$_2$$^{100}$MoO$_4$ scintillating calorimeters, each with a mass of$\sim$ 0.2 kg, operated at $\sim$20 mK. We present here the final analysis withthe full exposure of CUPID-Mo ($^{100}$Mo exposure of 1.47 kg$\times$yr) usedto search for lepton number violation via 0$u\beta\beta$ decay. We report onvarious analysis improvements since the previous result on a subset of data,reprocessing all data with these new techniques. We observe zero events in theregion of interest and set a new limit on the $^{100}$Mo 0$u\beta\beta$ decayhalf-life of $T^{0u}_{1/2} > 1.8 \times 10^{24}$ year (stat.+syst.) at 90%CI. Under the light Majorana neutrino exchange mechanism this corresponds to aneffective Majorana neutrino mass of $\left <(0.28$--$0.49)$ eV, dependent upon the nuclear matrix element utilized.