First results on Ge-76 neutrinoless double beta decay from CDEX-1 experiment
First results on Ge-76 neutrinoless double beta decay from CDEX-1 experiment
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CDEX-1 实验中 Ge-76 无中微子双 β 衰变的初步结果
DOI：
10.1007/s11433-017-9038-4
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Zen
中科院分区：
文献类型：
--
作者：
Wang Li;Yue Qian;Kang KeJun;Cheng JianPing;Li YuanJing;Chen QingHao;Deng Zhi;Gong Hui;He QingJu;Hu JinWei;Jia LiPing;Jiang Hao;Li JianMin;Li Jin;Li YuLan;Ma Hao;Ma JingLu;Pan XingYu;Tang WeiYou;Wang Qing;Wu YuCheng;Xue Tao;Yang LiTao;Yi Nan;Zeng WeiHe;Zen
We report the first results on76Ge neutrinoless double beta decay from stage one of the China dark-matter experiment (CDEX). A p-type point-contact high-purity germanium detector with a mass of 994 g has been installed to detect neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg d has been analyzed over a wide spectral band from 500 keV to 3 MeV. The average event rate obtained was about 0.012 counts per keV per kg per day over the 2.039 MeV energy range. The half-life of76Ge neutrinoless double beta decay derived based on this result isT1/20ν>6.4×1022yr (90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved.
