Cover Image

Saved in:
Bibliographic Details
Main Authors: PandaX Collaboration, Yuan, Zhe, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cui, Xiangyi, Deng, Manna, Fan, Yingjie, Fang, Deqing, Fu, Xuanye, Gao, Zhixing, Ge, Yujie, Geng, Lisheng, Giboni, Karl, Guo, Xunan, Guo, Xuyuan, Guo, Zichao, Han, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Houqi, Huang, Junting, Huang, Yule, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Lan, Xiaorun, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Peiyuan, Li, Shuaijie, Li, Tao, Li, Yangdong, Li, Zhiyuan, Lin, Qing, Liu, Jianglai, Liu, Yuanchun, Lu, Congcong, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Yugang, Mao, Yajun, Meng, Yue, Pang, Binyu, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shan, Dong, Shang, Xiaofeng, Shao, Xiyuan, Shen, Guofang, Shen, Manbin, Sun, Wenliang, Sun, Xuyan, Tao, Yi, Tian, Yueqiang, Tian, Yuxin, Wang, Anqing, Wang, Guanbo, Wang, Hao, Wang, Haoyu, Wang, Jiamin, Wang, Lei, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Shibo, Wang, Siguang, Wang, Wei, Wang, Xu, Wang, Zhou, Wei, Yuehuan, Wu, Weihao, Wu, Yuan, Xiao, Mengjiao, Xiao, Xiang, Xiong, Kaizhi, Xu, Jianqin, Xu, Yifan, Yao, Shunyu, Yan, Binbin, Yan, Xiyu, Yang, Yong, Ye, Peihua, Yu, Chunxu, Yuan, Ying, Yun, Youhui, Zeng, Xinning, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Siyuan, Zhang, Shu, Zhang, Tao, Zhang, Wei, Zhang, Yang, Zhang, Yingxin, Zhang, Yuanyuan, Zhao, Li, Zhao, Kangkang, Zhou, Jifang, Zhou, Jiaxu, Zhou, Jiayi, Zhou, Ning, Zhou, Xiaopeng, Zhou, Zhizhen, Zhu, Chenhui, Fang, Dong-Liang, Li, Yu-Feng
Format: Preprint
Published: 2025
Subjects:
Nuclear Experiment
High Energy Physics - Experiment
Online Access:https://arxiv.org/abs/2512.04849
Tags: Add Tag
No Tags, Be the first to tag this record!
Table of Contents:
  • The continuous spectrum of double beta decay ($ββ$) provides a sensitive probe to test the predictions of the standard model and to search for signatures of new physics beyond it. We present a comprehensive analysis of the $^{136}$Xe $ββ$ spectrum utilizing $39.1 \pm 0.7~\textrm{kg}\cdot\textrm{yr}$ of $^{136}$Xe exposure from the PandaX-4T experiment. The analysis yields the most precise measurement to date of the $^{136}$Xe two-neutrino double beta decay ($2νββ$) half-life, $(2.14 \pm 0.05) \times 10^{21}$ years, the uncertainty of which is reduced by a factor of 2 compared to our previous result. We measure the parameter $ξ_{31}^{2ν}$, defined as the ratio between the subleading and leading components of the $^{136}$Xe $2νββ$ nuclear matrix element, to be $0.59^{+0.41}_{-0.38}$, which is consistent with theoretical predictions. We also search for Majoron-emitting modes of $^{136}$Xe $ββ$, establishing the most stringent limit for the spectral index $n=7$.

Similar Items