Measurement of two-neutrino double electron capture half-life of 124Xe with PandaX-4T

A bstract Detailed studies of two-neutrino double electron capture (2 ν DEC) is a crucial step towards searching for the neutrinoless mode to explore the Majorana nature of neutrinos. We have measured precisely the half-life of the 2 ν DEC process in 124 Xe, utilizing a total exposure of 1.73 tonne year from the commissioning run and the first science run of the PandaX-4T experiment. A time-dependent background model in the $$ \mathcal{O} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (10 keV) energy is constructed for the first time in PandaX-4T data. With an unbinned maximum likelihood fit, we determine the half-life of the 2 ν DEC process to be (1.03 ± 0.15 stat ± 0.08 sys ) × 10 22 yr. Furthermore, we have evaluated the capture fraction for both electrons captured from the K shell ( KK ) to be (65 ± 5)%, which aligns with the 124 Xe nuclear model calculations within 1.8 σ .

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Publication Details

Journal
Journal of High Energy Physics
Published
2025-05-14
DOI
https://doi.org/10.1007/jhep05(2025)119
Citations
2
Primary Topic
Neutrino Physics Research
Type
article
Field-Weighted Citation Impact
3.74

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article

Measurement of two-neutrino double electron capture half-life of 124Xe with PandaX-4T

Guofang Shen, Jinrong He, Wei Zhang, Xiangdong Ji et al.
2 citations
Journal of High Energy Physics
Neutrino Physics Research
3.74
article

Measurement of two-neutrino double electron capture half-life of 124Xe with PandaX-4T

Guofang Shen, Jinrong He, Wei Zhang, Xiangdong Ji, Xiangpan Ji, K. Han, Yonglin Ju, Lingyin Luo, J. Huang, Li‐Sheng Geng, Yunhua Chen, Ruquan Hou, Zhaokan Cheng, Y. Wei, Wu Yuan, Zhixing Gao, Peihua Ye, Xiang Xiao, Shunyu Yao, Wenliang Sun, Xiaopeng Zhou, Ningchun Qi, Wei Chen, Zhizhen Zhou, Yi Tao, Binbin Yan, Deqing Fang, Jiaxu Zhou, Xuyang Ning, Jianglai Liu, Yue Meng, Tao Zhang, Chencheng Han, Yunyang Luo, Q. Lin, Chenxiang Li, W. Wang, Yuanyuan Zhang, Dong Shan, Jiamin Wang, Yingjie 英杰 Fan 樊, Peng Zhang, Zhou Wang, Xiuli Wang, Shu Zhang, Yu Hou, Li Zhao, Yifan Xu, Zhe Yuan, Shaobo Wang, Qiuhong Wang, Jifang Zhou, Xun Chen, Di Huang, Jiayi Zhou, Zichao Guo, Weihao Wu, Tao Li, Ying Yuan, Shuaijie Li, Shibo Zhang, Jiafu Li, Zhicheng Qian, Xinning Zeng, Mingchuan Li, Guanbo Wang, Chunxu Yu, Manbin Shen, Xiaofeng Shang, Changda He, Xiyuan Shao, Xunan Guo, Yong Yang, Anqing Wang, Xiangxiang Ren, Yajun Mao, Mengjiao Xiao, Siguang Wang, N. Zhou, Zhiyuan Li, Meng Wang, Yubo Zhou, Congcong Lu, Xiaoying Lu, Xiangyi Cui, Xuyuan Guo, Minzhen Zhang, Youhui Yun, Wenbo Ma, Yugang Ma, Kaizhi Xiong, Karl Giboni, Binyu Pang, Houqi Huang, Yingxin Zhang, Xiyu Yan, Yang Zhang, Zihao Bo, Xu Wang, Hao Wang, Lei Wang
article en
2 citations

Abstract

A bstract Detailed studies of two-neutrino double electron capture (2 ν DEC) is a crucial step towards searching for the neutrinoless mode to explore the Majorana nature of neutrinos. We have measured precisely the half-life of the 2 ν DEC process in 124 Xe, utilizing a total exposure of 1.73 tonne year from the commissioning run and the first science run of the PandaX-4T experiment. A time-dependent background model in the $$ \mathcal{O} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (10 keV) energy is constructed for the first time in PandaX-4T data. With an unbinned maximum likelihood fit, we determine the half-life of the 2 ν DEC process to be (1.03 ± 0.15 stat ± 0.08 sys ) × 10 22 yr. Furthermore, we have evaluated the capture fraction for both electrons captured from the K shell ( KK ) to be (65 ± 5)%, which aligns with the 124 Xe nuclear model calculations within 1.8 σ .

Journal of High Energy PhysicsVol. 2025(5)
University of Science and Technology of China (CN), Shandong University (CN), Sun Yat-sen University (CN), Shanghai Jiao Tong University (CN), Yantai University (CN), Chinese Academy of Sciences (CN), Peking University (CN), Nankai University (CN), Fudan University (CN), Chengdu University of Technology (CN), Institute of Particle Physics (CA), Shanghai Liangyou (China) (CN), Yalong Hydro (China) (CN), Institute of Modern Physics (CN), Institute of Natural Science (KP), University of Maryland, College Park (US), Shandong University of Science and Technology (CN), Beihang University (CN)
National Science Foundation, Tencent, National Natural Science Foundation of China, Chinese Academy of Sciences, China Postdoctoral Science Foundation, CAS Center for Excellence in Particle Physics, Office of Science, Fundamental Research Funds for the Central Universities
Openalex Percentile: Top 8%
Neutrino Physics Research
3.74
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