학술논문
Search for Double-Beta Decay of $\mathrm{^{130}Te}$ to the $0^+$ States of $\mathrm{^{130}Xe}$ with CUORE
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article
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Collaboration, CUORE; Adams, DQ; Alduino, C; Alfonso, K; III, FT Avignone; Azzolini, O; Bari, G; Bellini, F; Benato, G; Branca, M Biassoni A; Brofferio, C; Bucci, C; Camilleri, J; Caminata, A; Campani, A; Canonica, L; Cao, XG; Capelli, S; Cappelli, L; Cardani, L; Casali, P Carniti N; Celi, E; Copello, D Chiesa M Clemenza S; Cosmelli, C; Cremonesi, O; Creswick, RJ; D'Addabbo, A; Dafinei, I; Davis, CJ; Domizio, S Dell'Oro S Di; Dompè, V; Fang, DQ; Fantini, G; Ferri, M Faverzani E; Ferroni, F; Fiorini, E; Franceschi, MA; Freedman, SJ; Fu, SH; Fujikawa, BK; Giachero, A; Gironi, L; Giuliani, A; Gorla, P; Gotti, C; Gutierrez, TD; Han, K; Heeger, KM; Huang, RG; Huang, HZ; Johnston, J; Keppel, G; Kolomensky, Yu G; Ligi, C; Ma, L; Ma, YG; Marini, L; Maruyama, RH; Mayer, D; Mei, Y; Moggi, N; Morganti, S; Napolitano, T; Nastasi, M; Nikkel, J; Nones, C; Norman, EB; Nucciotti, A; Nutini, I; O'Donnell, T; Ouellet, JL; Pagan, S; Pagliarone, CE; Pagnanini, L; Pallavicini, M; Pattavina, L; Pavan, M; Pessina, G; Pettinacci, V; Pira, C; Pirro, S; Pozzi, S; Previtali, E; Puiu, A; Rosenfeld, C; Rusconi, C; Sakai, M; Sangiorgio, S; Schmidt, B; Scielzo, ND; Sharma, V; Singh, V; Sisti, M; Speller, D; Surukuchi, PT; Taffarello, L; Terranova, F; Tomei, C; Vetter, KJ; Vignati, M
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Abstract
The CUORE experiment is a large bolometric array searching for the leptonnumber violating neutrino-less double beta decay ($0u\beta\beta$) in theisotope $\mathrm{^{130}Te}$. In this work we present the latest results on twosearches for the double beta decay (DBD) of $\mathrm{^{130}Te}$ to the first$0^{+}_2$ excited state of $\mathrm{^{130}Xe}$: the $0u\beta\beta$ decay andthe Standard Model-allowed two-neutrinos double beta decay ($2u\beta\beta$).Both searches are based on a 372.5 kg$\times$yr TeO$_2$ exposure. Thede-excitation gamma rays emitted by the excited Xe nucleus in the final stateyield a unique signature, which can be searched for with low background bystudying coincident events in two or more bolometers. The closely packedarrangement of the CUORE crystals constitutes a significant advantage in thisregard. The median limit setting sensitivities at 90\% Credible Interval (C.I.)of the given searches were estimated as $\mathrm{S^{0u}_{1/2} = 5.6 \times10^{24} \: \mathrm{yr}}$ for the ${0u\beta\beta}$ decay and$\mathrm{S^{2u}_{1/2} = 2.1 \times 10^{24} \: \mathrm{yr}}$ for the${2u\beta\beta}$ decay. No significant evidence for either of the decay modeswas observed and a Bayesian lower bound at $90\%$ C.I. on the decay half livesis obtained as: $\mathrm{(T_{1/2})^{0u}_{0^+_2} > 5.9 \times 10^{24} \:\mathrm{yr}}$ for the $0u\beta\beta$ mode and$\mathrm{(T_{1/2})^{2u}_{0^+_2} > 1.3 \times 10^{24} \: \mathrm{yr}}$ for the$2u\beta\beta$ mode. These represent the most stringent limits on the DBD of$^{130}$Te to excited states and improve by a factor $\sim5$ the previousresults on this process.