Results of the search for neutrinoless double- ß decay in Mo 100 with the NEMO-3 experiment
Results of the search for neutrinoless double- ß decay in Mo 100 with the NEMO-3 experiment
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利用 NEMO-3 实验寻找 Mo 100 中无中微子双衰变的结果
DOI：
10.1103/physrevd.92.072011
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发表时间：
2015
影响因子：
5
通讯作者：
Arnold R
中科院分区：
文献类型：
--
作者：
Arnold R
NEMO-3探测器于2003年至2010年在Modane地下实验室运行，旨在寻找无中微子双衰变。我们报告了用6.914 kg的探测器寿命为4.96年的整个NEMO-3数据集搜索衰变的最终结果。我们对信号区的预期背景进行了详细的研究，没有发现数据中有衰减的证据。在[2.8 - 3.2] MeV的信号区，观测到的本底能级为，在[3.2 - 10] MeV的区间内没有观测到事件。因此，我们推导出一个下限的半衰期ofdecades inof在90%的置信水平下，衰变运动学的假设类似的轻马约拉纳中微子交换。根据用于计算核矩阵元的模型，有效马约拉纳中微子质量的极限位于范围内。我们还报告了对其他衰变轻子数破坏机制的限制。
The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double-() decay. We report the final results of a search fordecays with 6.914 kg ofusing the entire NEMO-3 data set with a detector live time of 4.96 yr, which corresponds to an exposure of. We perform a detailed study of the expected background in thesignal region and find no evidence ofdecays in the data. The level of observed background in thesignal region [2.8–3.2] MeV is, and no events are observed in the interval [3.2–10] MeV. We therefore derive a lower limit on the half-life ofdecays inofat the 90% confidence level, under the hypothesis of decay kinematics similar to that for light Majorana neutrino exchange. Depending on the model used for calculating nuclear matrix elements, the limit for the effective Majorana neutrino mass lies in the range. We also report constraints on other lepton-number violating mechanisms fordecays.