利用CUORE-0探测器寻找碲-130的无中微子双β衰变。

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

作者信息

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

机构信息

Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA.

出版信息

Phys Rev Lett. 2015 Sep 4;115(10):102502. doi: 10.1103/PhysRevLett.115.102502. Epub 2015 Sep 3.

DOI:10.1103/PhysRevLett.115.102502

PMID:26382673

Abstract

We report the results of a search for neutrinoless double-beta decay in a 9.8 kg yr exposure of (130)Te 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 2.9×10(24) yr and surpasses the sensitivity of previous searches. We find no evidence for neutrinoless double-beta decay of (130)Te and place a Bayesian lower bound on the decay half-life, T(1/2)(0ν)>2.7×10(24) yr at 90% C.L. Combining CUORE-0 data with the 19.75 kg yr exposure of (130)Te from the Cuoricino experiment we obtain T(1/2)(0ν)>4.0×10(24) 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, m(ββ)<270-760 meV.

摘要

我们报告了使用测热探测器阵列CUORE - 0，在9.8千克·年的（130）Te曝光量下寻找无中微子双β衰变的结果。感兴趣区域内探测器的特征能量分辨率和本底水平分别为半高宽5.1±0.3 keV和0.058±0.004（统计）±0.002（系统）计数/（keV·千克·年）。该实验的90%置信水平下限半衰期灵敏度中位数为2.9×10²⁴年，超过了此前搜索的灵敏度。我们未发现（130）Te无中微子双β衰变的证据，并给出了衰变半衰期的贝叶斯下限，在90%置信水平下T₁/₂（0ν）>2.7×10²⁴年。将CUORE - 0的数据与Cuoricino实验中19.75千克·年的（130）Te曝光量相结合，我们在90%置信水平（贝叶斯）下得到T₁/₂（0ν）>4.0×10²⁴年，这是迄今为止对该半衰期最严格的限制。使用一系列核矩阵元估计值，我们将此解释为对有效马约拉纳中微子质量的限制，mββ<270 - 760 meV。