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arXiv · 2407.10892

First Indication of Solar $^8$B Neutrino Flux through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T

PandaX Collaboration·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
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Abstract

The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar $^8$B neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and 1.04 tonne$\cdot$year are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of 2.8$\pm$0.5 and 251$\pm$32 background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit $^8$B neutrino signal of 3.5 (75) events from the paired (US2) data sample, with $\sim$37\% uncertainty, and the background-only hypothesis is disfavored at 2.64$σ$ significance. This gives a solar $^8$B neutrino flux of ($8.4\pm3.1$)$\times$10$^6$ cm$^{-2}$s$^{-1}$, consistent with the standard solar model prediction. It is also the first indication of solar $^8$B neutrino ``fog'' in a dark matter direct detection experiment.

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PandaX Collaboration, 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. 2024-09-13. First Indication of Solar $^8$B Neutrino Flux through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T. https://arxiv.org/abs/2407.10892

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