Results on Neutrinoless Double-β Decay of 76Ge from Phase I of the GERDA Experiment
Results on Neutrinoless Double-β Decay of 76Ge from Phase I of the GERDA Experiment
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DOI：
10.1103/physrevlett.111.122503
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发表时间：
2013-09-19
影响因子：
8.6
通讯作者：
Zuzel, G.
中科院分区：
文献类型：
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作者：
Agostini, M.;Allardt, M.;Zuzel, G.
无中微子双β衰变是一个违反轻子数守恒的过程。据预测，它将出现在粒子物理标准模型的扩展中。这封信报告了意大利格兰萨索实验室的锗探测器阵列(Gerda)实验第一阶段的结果，该实验旨在寻找同位素Ge-76的无中微子双β衰变。本分析中考虑的数据是在2011年11月至2013年5月期间收集的，年总暴露量为21.6公斤。进行了盲目分析。脉冲辨别后的本底指数约为1×10(-2)次/(Kev Kg Yr)。没有观测到任何信号，并得到了Ge-76，T-1/2(0nu)和GT；2.1×10(25)yr(90%C.L.)的无中微子双β衰变的半衰期下限。与以前使用GE-76的实验结果相结合，得到T-1/2(0nu)和GT；3.0×10(25)yr(90%C.L.)。
Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope Ge-76. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 x 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of Ge-76, T-1/2(0 nu) > 2.1 x 10(25) yr (90% C.L.). The combination with the results from the previous experiments with Ge-76 yields T-1/2(0 nu) > 3.0 x 10(25) yr (90% C. L.).