Browsing by Author "Jian.Ping. Chang"

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First results on 76Ge neutrinoless double beta decay from CDEX-1 experiment
(Science in China Press, 2017) Li Wang; Qian Yue; Ke.Jun. Kang; Jian.Ping. Cheng; Yuan.Jing. Li; Tsz.King.Henry. Wong; Shin.Ted. Lin; Jian.Ping. Chang; Jing.Han. Chen; Qing.Hao. Chen; Yun.Hua. Chen; Zhi Deng; Qiang Du; Hui Gong; Li He; Qing.Ju. He; Jin.Wei. Hu; Han.Xiong. Huang; Teng.Rui. Huang; Li.Ping. Jia; Hao Jiang; Hau.Bin. Li; Hong Li; Jian.Min. Li; Jin Li; Jun Li; Xia Li; Xue.Qian. Li; Yu.Lan. Li; Fong.Kay. Lin; Shu.Kui. Liu; Hao Ma; Jing.Lu. Ma; Xing.Yu. Pan; Jie Ren; Xi.Chao. Ruan; Man.Bin. Shen; Vivek Sharma; Lakhwinder Singh; Manoj.Kumar. Singh; Manoj.Kumar. Singh; Arun.Kumar. Soma; Chang.Jian. Tang; Wei.You. Tang; Chao.Hsiung. Tseng; Ji.Min. Wang; Qing Wang; Shi.Yong. Wu; Yu.Cheng. Wu; Hao.Yang. Xing; Yin Xu; Tao Xue; Li.Tao. Yang; Song.Wei. Yang; Nan Yi; Chun.Xu. Yu; Hai.Jun. Yu; Wei.He. Zeng; Xiong.Hui. Zeng; Zhi Zeng; Lan Zhang; Yun.Hua. Zhang; Ming.Gang. Zhao; Wei Zhao; Ji.Fang. Zhou; Zu.Ying. Zhou; Jing.Jun. Zhu; Wei.Bin. Zhu; Zhong.Hua. Zhu
We report the first results on 76Ge 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 of 76Ge neutrinoless double beta decay derived based on this result is T1/2 0ν>6.4×1022 yr (90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved. © 2017, Science China Press and Springer-Verlag Berlin Heidelberg.