We report the results of a search for neutrinoless double-beta decay in a 9.8 kg yr exposure of 130Te using a bolometric detector array, CUORE-0. The characteristic detector energy resolution and background level in the region of interest are 5.1 +/- 0.3 keV FWHM and 0.058 +/- 0.004(stat) +/- 0.002(syst) counts/(keV kg yr), respectively. The median 90% C.L. lower-limit half-life sensitivity of the experiment is 2.9 × 1024 yr and surpasses the sensitivity of previous searches. We find no evidencefor neutrinoless double-beta decay of 130Te and place a Bayesian lower bound on the decay half-life, T0ν1/2 > 2.7 × 1024 yr at 90% C.L. Combining CUORE-0 data with the 19.75 kg yr exposure of 130Te from the Cuoricino experiment we obtain T0ν1/2 > 4.0 × 1024 yr at 90% C.L. (Bayesian), the most stringent limit to date on this half-life. Using a range of nuclear matrix element estimates we interpret this as a limit on the effective Majorana neutrino mass, mββ < 270–760 meV.

Search for Neutrinoless Double-Beta Decay of Te 130 with CUORE-0

DENINNO, MARIA MADDALENA;MOGGI, NICCOLO';ZUCCHELLI, STEFANO
2015

Abstract

We report the results of a search for neutrinoless double-beta decay in a 9.8 kg yr exposure of 130Te using a bolometric detector array, CUORE-0. The characteristic detector energy resolution and background level in the region of interest are 5.1 +/- 0.3 keV FWHM and 0.058 +/- 0.004(stat) +/- 0.002(syst) counts/(keV kg yr), respectively. The median 90% C.L. lower-limit half-life sensitivity of the experiment is 2.9 × 1024 yr and surpasses the sensitivity of previous searches. We find no evidencefor neutrinoless double-beta decay of 130Te and place a Bayesian lower bound on the decay half-life, T0ν1/2 > 2.7 × 1024 yr at 90% C.L. Combining CUORE-0 data with the 19.75 kg yr exposure of 130Te from the Cuoricino experiment we obtain T0ν1/2 > 4.0 × 1024 yr at 90% C.L. (Bayesian), the most stringent limit to date on this half-life. Using a range of nuclear matrix element estimates we interpret this as a limit on the effective Majorana neutrino mass, mββ < 270–760 meV.
2015
Alfonso, K.; Artusa, D.R.; Avignone, F.T.; Azzolini, O.; Balata, M.; Banks, T.I.; Bari, G.; Beeman, J.W.; Bellini, F.; Bersani, A.; Biassoni, M.; Brofferio, C.; Bucci, C.; Caminata, A.; Canonica, L.; Cao, X.G.; Capelli, S.; Cappelli, L.; Carbone, L.; Cardani, L.; Casali, N.; Cassina, L.; Chiesa, D.; Chott, N.; Clemenza, M.; Copello, S.; Cosmelli, C.; Cremonesi, O.; Creswick, R.J.; Cushman, J.S.; Dafinei, I.; Dally, A.; Dell'Oro, S.; Deninno, M.M.; Di Domizio, S.; Di Vacri, M.L.; Drobizhev, A.; Ejzak, L.; Fang, D.Q.; Faverzani, M.; Fernandes, G.; Ferri, E.; Ferroni, F.; Fiorini, E.; Freedman, S.J.; Fujikawa, B.K.; Giachero, A.; Gironi, L.; Giuliani, A.; Gorla, P.; Gotti, C.; Gutierrez, T.D.; Haller, E.E.; Han, K.; Hansen, E.; Heeger, K.M.; Hennings-Yeomans, R.; Hickerson, K.P.; Huang, H.Z.; Kadel, R.; Keppel, G.; Kolomensky, Yu.G.; Lim, K.E.; Liu, X.; Ma, Y.G.; Maino, M.; Martinez, M.; Maruyama, R.H.; Mei, Y.; Moggi, N.; Morganti, S.; Nisi, S.; Nones, C.; Norman, E.B.; Nucciotti, A.; O'Donnell, T.; Orio, F.; Orlandi, D.; Ouellet, J.L.; Pagliarone, C.E.; Pallavicini, M.; Palmieri, V.; Pattavina, L.; Pavan, M.; Pedretti, M.; Pessina, G.; Pettinacci, V.; Piperno, G.; Pirro, S.; Pozzi, S.; Previtali, E.; Rosenfeld, C.; Rusconi, C.; Sala, E.; Sangiorgio, S.; Santone, D.; Scielzo, N.D.; Sisti, M.; Smith, A.R.; Taffarello, L.; Tenconi, M.; Terranova, F.; Tomei, C.; Trentalange, S.; Ventura, G.; Vignati, M.; Wagaarachchi, S.L.; Wang, B.S.; Wang, H.W.; Wielgus, L.; Wilson, J.; Winslow, L.A.; Wise, T.; Zanotti, L.; Zarra, C.; Zhang, G.Q.; Zhu, B.X.; Zucchelli, S.
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