Search for double beta decay of 136Xe to the $$ {0}_1^{+} $$ excited state of 136Ba with PandaX-4T

A bstract We perform a search of double beta decay of 136 Xe to the excited state, $$ {0}_1^{+} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> , of 136 Ba (2 νββ - $$ {0}_1^{+} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> ), using the dual-phase xenon detector of PandaX-4T with the first 94.9-day commissioning data. The multi-site events are reconstructed up to the MeV energy scale, which helps to improve the background model significantly. The background contribution from the stainless steel platform outside PandaX-4T cryostat is evaluated for the first time. No significant evidence for 2 νββ - $$ {0}_1^{+} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> is observed, resulting in a lower limit on half-life of 7 . 5 × 10 22 yr at the 90% confidence level. This is the first experimental limit on such a rare decay in a natural xenon-based detector.

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Publication Details

Journal
Journal of High Energy Physics
Published
2025-05-09
DOI
https://doi.org/10.1007/jhep05(2025)089
Primary Topic
Neutrino Physics Research
Type
article
Field-Weighted Citation Impact
0.00

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article

Search for double beta decay of 136Xe to the $$ {0}_1^{+} $$ excited state of 136Ba with PandaX-4T

Xiangpan Ji, Yonglin Ju, Lingyin Luo, Chenxiang Li et al.
Journal of High Energy Physics
Neutrino Physics Research
article

Search for double beta decay of 136Xe to the $$ {0}_1^{+} $$ excited state of 136Ba with PandaX-4T

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

Abstract

A bstract We perform a search of double beta decay of 136 Xe to the excited state, $$ {0}_1^{+} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> , of 136 Ba (2 νββ - $$ {0}_1^{+} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> ), using the dual-phase xenon detector of PandaX-4T with the first 94.9-day commissioning data. The multi-site events are reconstructed up to the MeV energy scale, which helps to improve the background model significantly. The background contribution from the stainless steel platform outside PandaX-4T cryostat is evaluated for the first time. No significant evidence for 2 νββ - $$ {0}_1^{+} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> is observed, resulting in a lower limit on half-life of 7 . 5 × 10 22 yr at the 90% confidence level. This is the first experimental limit on such a rare decay in a natural xenon-based detector.

Journal of High Energy PhysicsVol. 2025(5)
University of Science and Technology of China (CN), Shandong 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), University of Maryland, College Park (US), 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 95%
Neutrino Physics Research
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