학술논문
Search for Double-Beta Decay of $\mathrm{^{130}Te}$ to the $0^+$ States of $\mathrm{^{130}Xe}$ with CUORE
Document Type
Working Paper
Author
CUORE Collaboration; Adams, D. Q.; Alduino, C.; Alfonso, K.; Avignone III, F. T.; 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, X. G.; Capelli, S.; Cappelli, L.; Cardani, L.; Casali, P. Carniti N.; Celi, E.; Copello, D. Chiesa M. Clemenza S.; Cosmelli, C.; Cremonesi, O.; Creswick, R. J.; D'Addabbo, A.; Dafinei, I.; Davis, C. J.; Di Domizio, S. Dell'Oro S.; Dompè, V.; Fang, D. Q.; Fantini, G.; Ferri, M. Faverzani E.; Ferroni, F.; Fiorini, E.; Franceschi, M. A.; Freedman, S. J.; Fu, S. H.; Fujikawa, B. K.; Giachero, A.; Gironi, L.; Giuliani, A.; Gorla, P.; Gotti, C.; Gutierrez, T. D.; Han, K.; Heeger, K. M.; Huang, R. G.; Huang, H. Z.; Johnston, J.; Keppel, G.; Kolomensky, Yu. G.; Ligi, C.; Ma, L.; Ma, Y. G.; Marini, L.; Maruyama, R. H.; Mayer, D.; Mei, Y.; Moggi, N.; Morganti, S.; Napolitano, T.; Nastasi, M.; Nikkel, J.; Nones, C.; Norman, E. B.; Nucciotti, A.; Nutini, I.; O'Donnell, T.; Ouellet, J. L.; Pagan, S.; Pagliarone, C. E.; 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, N. D.; Sharma, V.; Singh, V.; Sisti, M.; Speller, D.; Surukuchi, P. T.; Taffarello, L.; Terranova, F.; Tomei, C.; Vetter, K. J.; Vignati, M.; Wagaarachchi, S. L.; Wang, B. S.; Welliver, B.; Wilson, J.; Wilson, K.; Winslow, L. A.; Zimmermann, S.; Zucchelli, S.
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Abstract
The CUORE experiment is a large bolometric array searching for the lepton number violating neutrino-less double beta decay ($0\nu\beta\beta$) in the isotope $\mathrm{^{130}Te}$. In this work we present the latest results on two searches for the double beta decay (DBD) of $\mathrm{^{130}Te}$ to the first $0^{+}_2$ excited state of $\mathrm{^{130}Xe}$: the $0\nu\beta\beta$ decay and the Standard Model-allowed two-neutrinos double beta decay ($2\nu\beta\beta$). Both searches are based on a 372.5 kg$\times$yr TeO$_2$ exposure. The de-excitation gamma rays emitted by the excited Xe nucleus in the final state yield a unique signature, which can be searched for with low background by studying coincident events in two or more bolometers. The closely packed arrangement of the CUORE crystals constitutes a significant advantage in this regard. The median limit setting sensitivities at 90\% Credible Interval (C.I.) of the given searches were estimated as $\mathrm{S^{0\nu}_{1/2} = 5.6 \times 10^{24} \: \mathrm{yr}}$ for the ${0\nu\beta\beta}$ decay and $\mathrm{S^{2\nu}_{1/2} = 2.1 \times 10^{24} \: \mathrm{yr}}$ for the ${2\nu\beta\beta}$ decay. No significant evidence for either of the decay modes was observed and a Bayesian lower bound at $90\%$ C.I. on the decay half lives is obtained as: $\mathrm{(T_{1/2})^{0\nu}_{0^+_2} > 5.9 \times 10^{24} \: \mathrm{yr}}$ for the $0\nu\beta\beta$ mode and $\mathrm{(T_{1/2})^{2\nu}_{0^+_2} > 1.3 \times 10^{24} \: \mathrm{yr}}$ for the $2\nu\beta\beta$ mode. These represent the most stringent limits on the DBD of $^{130}$Te to excited states and improve by a factor $\sim5$ the previous results on this process.
Comment: 13 pages, 6 figures
Comment: 13 pages, 6 figures