Determination of Double Beta Decay Half-Life of 136 Xe with the PandaX-4T Natural Xenon Detector

Author:

Si Lin1,Cheng Zhaokan2,Abdukerim Abdusalam1,Bo Zihao1,Chen Wei1,Chen Xun13,Chen Yunhua4,Cheng Chen5,Cheng Yunshan67,Cui Xiangyi8,Fan Yingjie9,Fang Deqing10,Fu Changbo10,Fu Mengting11,Geng Lisheng1213,Giboni Karl1,Gu Linhui1,Guo Xuyuan4,Han Ke1ORCID,He Changda1,He Jinrong4,Huang Di1,Huang Yanlin14,Huang Zhou1,Hou Ruquan3,Ji Xiangdong15,Ju Yonglin16,Li Chenxiang1,Li Jiafu5,Li Mingchuan4,Li Shu16,Li Shuaijie8,Lin Qing1718,Liu Jianglai138,Lu Xiaoying67,Luo Lingyin11,Luo Yunyang1718,Ma Wenbo1,Ma Yugang10,Mao Yajun11,Meng Yue13,Shaheed Nasir67,Shang Xiaofeng1,Ning Xuyang1,Qi Ningchun4,Qian Zhicheng1,Ren Xiangxiang67,Shang Changsong4,Shen Guofang12,Sun Wenliang4,Tan Andi15,Tao Yi13,Wang Anqing67,Wang Meng67,Wang Qiuhong10,Wang Shaobo119ORCID,Wang Siguang11,Wang Wei25,Wang Xiuli16,Wang Zhou138,Wei Yuehuan2,Wu Mengmeng5,Wu Weihao1,Xia Jingkai1,Xiao Mengjiao15,Xiao Xiang5ORCID,Xie Pengwei8,Yan Binbin1,Yan Xiyu14,Yang Jijun1,Yang Yong1,Yu Chunxu9,Yuan Jumin67,Yuan Ying1,Yuan Zhe10,Zhang Dan15,Zhang Minzhen1,Zhang Peng4,Zhang Shibo1,Zhang Shu5,Zhang Tao1,Zhao Li1,Zheng Qibin14,Zhou Jifang4,Zhou Ning1,Zhou Xiaopeng12,Zhou Yong4

Affiliation:

1. 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

2. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

3. Sichuan Research Institute, Shanghai Jiao Tong University, Chengdu 610213, China

4. Yalong River Hydropower Development Company, Ltd., 288 Shuanglin Road, Chengdu 610051, China

5. School of Physics, Sun Yat-sen University, Guangzhou 510275, China

6. Research Center for Particle Science and Technology, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237 Shandong, China

7. Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education, Shandong University, Qingdao, 266237 Shandong, China

8. Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China

9. School of Physics, Nankai University, Tianjin 300071, China

10. Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China

11. School of Physics, Peking University, Beijing 100871, China

12. School of Physics, Beihang University, Beijing 100191, China

13. International Research Center for Nuclei and Particles in the Cosmos & Beijing key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China

14. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

15. Department of Physics, University of Maryland, College Park, Maryland 20742, USA

16. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

17. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China

18. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

19. SJTU Paris Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract

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 136 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 136 Xe exposure of 15.5 kg-year, we establish the half-life as 2.27 ± 0.03 s t a t . ± 0.10 s y s t . × 1 0 21 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.

Funder

Yalong River Hydropower Development Company Ltd

CJPL

Tencent Foundation in China

Hongwen Foundation in Hong Kong

Chinese Academy of Sciences Center for Excellence in Particle Physics

Shanghai Jiao Tong University

Office of Science and Technology, Shanghai Municipal Government

National Natural Science Foundation of China

Ministry of Science and Technology of the People's Republic of China

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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