Browsing by Author "Bing-Tao Zhang"

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Searching for 76Ge neutrinoless double beta decay with the CDEX-1B experiment
(Institute of Physics, 2024) Bing-Tao Zhang; Jun-Zheng Wang; Li-Tao Yang; Qian Yue; Ke-Jun Kang; Yuan-Jing Li; Hai-Peng An; C. Greeshma; Jian-Ping Chang; Yun-Huan Chen; Jian-Ping Cheng; Wen-Han Dai; Zhi Deng; Chang-Hao Fang; Xin-Ping Geng; Hui Gong; Qiu-Ju Guo; Xu-Yuan Guo; Li He; Sheng-Ming He; Jin-Wei Hu; Han-Xiong Huang; Tu-Chen Huang; Hai-Tao Jia; Xi Jiang; S. Karmakar; Hao-Bin Li; Jian-Min Li; Jin Li; Qian-Yun Li; Ren-Ming-Jie Li; Xue-Qian Li; Yu-Lan Li; Yi-Fan Liang; Bin Liao; Fong-Kay Lin; Shin-Ted Lin; Jia-Xuan Liu; Shu-Kui Liu; Yan-Dong Liu; Yu Liu; Yuan-Yuan Liu; Zhong-Zhi Liu; Hao Ma; Yu-Cai Mao; Qi-Yuan Nie; Jin-Hua Ning; Hui Pan; Ning-Chun Qi; Jie Ren; Xi-Chao Ruan; Ze She; Manoj Kumar Singh; Tian-Xi Sun; Chang-Jian Tang; Wei-You Tang; Yang Tian; Guang-Fu Wang; Li Wang; Qing Wang; Yu-Feng Wang; Yun-Xiang Wang; Henry-Tsz-King Wong; Shi-Yong Wu; Yu-Cheng Wu; Hao-Yang Xing; Rui Xu; Yin Xu; Tao Xue; Yu-Lu Yan; Nan Yi; Chun-Xu Yu; Hai-Jun Yu; Jian-Feng Yue; Ming Zeng; Zhi Zeng; Feng-Shou Zhang; Lei Zhang; Zhen-Hua Zhang; Zhen-Yu Zhang; Kang-Kang Zhao; Ming-Gang Zhao; Ji-Fang Zhou; Zu-Ying Zhou; Jing-Jun Zhou
We operated a p-type point contact high purity germanium (PPCGe) detector (CDEX-1B, 1.008 kg) in the China Jinping Underground Laboratory (CJPL) for 500.3 days to search for neutrinoless double beta ( ) decay of 76Ge. A total of 504.3 kg day effective exposure data was accumulated. The anti-coincidence and the multi/single-site event (MSE/SSE) discrimination methods were used to suppress the background in the energy region of interest (ROI, 1989-2089 keV for this work) with a factor of 23. A background level of 0.33 counts/ (keV kg yr) was realized. The lower limit on the half life of 76Ge decay was constrained as , corresponding to the upper limits on the effective Majorana neutrino mass: 3.2-7.5 . © 2024 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.