Si Lin, Cheng Zhaokan, Abdukerim Abdusalam, Bo Zihao, Chen Wei, Chen Xun, Chen Yunhua, Cheng Chen, Cheng Yunshan, Cui Xiangyi, Fan Yingjie, Fang Deqing, Fu Changbo, Fu Mengting, Geng Lisheng, Giboni Karl, Gu Linhui, Guo Xuyuan, Han Ke, He Changda, He Jinrong, Huang Di, Huang Yanlin, Huang Zhou, Hou Ruquan, Ji Xiangdong, Ju Yonglin, Li Chenxiang, Li Jiafu, Li Mingchuan, Li Shu, Li Shuaijie, Lin Qing, Liu Jianglai, Lu Xiaoying, Luo Lingyin, Luo Yunyang, Ma Wenbo, Ma Yugang, Mao Yajun, Meng Yue, Shaheed Nasir, Shang Xiaofeng, Ning Xuyang, Qi Ningchun, Qian Zhicheng, Ren Xiangxiang, Shang Changsong, Shen Guofang, Sun Wenliang, Tan Andi, Tao Yi, Wang Anqing, Wang Meng, Wang Qiuhong, Wang Shaobo, Wang Siguang, Wang Wei, Wang Xiuli, Wang Zhou, Wei Yuehuan, Wu Mengmeng, Wu Weihao, Xia Jingkai, Xiao Mengjiao, Xiao Xiang, Xie Pengwei, Yan Binbin, Yan Xiyu, Yang Jijun, Yang Yong, Yu Chunxu, Yuan Jumin, Yuan Ying, Yuan Zhe, Zhang Dan, Zhang Minzhen, Zhang Peng, Zhang Shibo, Zhang Shu, Zhang Tao, Zhao Li, Zheng Qibin, Zhou Jifang, Zhou Ning, Zhou Xiaopeng, Zhou Yong
MOE Key Laboratory for Particle Astrophysics and Cosmology, Shanghai Key Laboratory for Particle Physics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China.
Research (Wash D C). 2022 Nov 25;2022:9798721. doi: 10.34133/2022/9798721. eCollection 2022.
Precise measurement of two-neutrino double beta decay (DBD) half-life is an important step for the searches of Majorana neutrinos with neutrinoless double beta decay. We report the measurement of DBD half-life of Xe using the PandaX-4T dual-phase Time Projection Chamber (TPC) with 3.7-tonne natural xenon and the first 94.9-day physics data release. The background model in the fiducial volume is well constrained in situ by events in the outer active region. With a Xe exposure of 15.5 kg-year, we establish the half-life as 2.27 ± 0.03() ± 0.10() × 10 years. This is the first DBD half-life measurement with natural xenon and demonstrates the physics capability of a large-scale liquid xenon TPC in the field of rare event searches.
精确测量双中微子双β衰变（DBD）半衰期是利用无中微子双β衰变来搜寻马约拉纳中微子的重要一步。我们报告了使用装有3.7吨天然氙的PandaX-4T双相时间投影室（TPC）对氙的DBD半衰期的测量，以及首次94.9天的物理数据发布。通过外部有源区的事例，本征体积内的本底模型在原位得到了很好的约束。在15.5千克·年的氙曝光量下，我们确定半衰期为2.27±0.03（）±0.10（）×10年。这是首次对天然氙进行DBD半衰期测量，展示了大型液氙TPC在稀有事件搜寻领域的物理能力。
