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<p>Detailed studies of two-neutrino double electron capture (2<i>ν</i>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<i>ν</i>DEC process in <sup>124</sup>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 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26194_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{O} \)</EquationSource> </InlineEquation>(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<i>ν</i>DEC process to be (1.03 ± 0.15<sub>stat</sub> ± 0.08<sub>sys</sub>) × 10<sup>22</sup> yr. Furthermore, we have evaluated the capture fraction for both electrons captured from the <i>K</i> shell (<i>KK</i>) to be (65 ± 5)%, which aligns with the <sup>124</sup>Xe nuclear model calculations within 1.8 <i>σ</i>.</p>

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

  • 期刊论文

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  • 发表日期：

    2025年5月14日

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

摘要

Detailed studies of two-neutrino double electron capture (2νDEC) 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 2νDEC process in 124Xe, 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 O \( \mathcal{O} \) (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 2νDEC process to be (1.03 ± 0.15stat ± 0.08sys) × 1022 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 124Xe nuclear model calculations within 1.8 σ.