Search for Double-Beta Decay of $\mathrm{^{130}Te}$ to the $0^+$ States of $\mathrm{^{130}Xe}$ with CUORE
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Search for Double-Beta Decay of $\mathrm{^{130}Te}$ to the $0^+$ States of $\mathrm{^{130}Xe}$ with CUORE

  • Author(s): 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;
  • Wagaarachchi, SL;
  • Wang, BS;
  • Welliver, B;
  • Wilson, J;
  • Wilson, K;
  • Winslow, LA;
  • Zimmermann, S;
  • Zucchelli, S
  • et al.
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.

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