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

被引：6

作者：

Bo, Zihao ^{[2
]}

Chen, Wei ^{[2
]}

Chen, Xun ^{[1
,2
,3
,4
]}

Chen, Yunhua ^{[4
,5
]}

Cheng, Zhaokan ^{[6
]}

Cui, Xiangyi ^{[1
]}

Fan, Yingjie ^{[7
]}

Fang, Deqing ^{[8
]}

Gao, Zhixing ^{[2
]}

Geng, Lisheng ^{[9
,10
,11
,12
]}

Giboni, Karl ^{[2
,4
]}

Guo, Xunan ^{[9
]}

Guo, Xuyuan ^{[4
,5
]}

Guo, Zichao ^{[9
]}

Han, Chencheng ^{[1
]}

Han, Ke ^{[2
,4
]}

He, Changda ^{[2
]}

He, Jinrong ^{[5
]}

Huang, Di ^{[2
]}

Huang, Houqi ^{[13
]}

Huang, Junting ^{[2
,4
]}

Hou, Ruquan ^{[3
,4
]}

Hou, Yu ^{[14
]}

Ji, Xiangdong ^{[15
]}

Ji, Xiangpan ^{[16
]}

Ju, Yonglin ^{[4
,14
]}

Li, Chenxiang ^{[2
]}

Li, Jiafu ^{[17
]}

Li, Mingchuan ^{[4
,5
]}

Li, Shuaijie ^{[2
,4
,5
]}

Li, Tao ^{[6
]}

Li, Zhiyuan ^{[6
]}

Lin, Qing ^{[18
,19
]}

Liu, Jianglai ^{[1
,2
,3
,4
]}

Lu, Congcong ^{[14
]}

Lu, Xiaoying ^{[20
,21
]}

Luo, Lingyin ^{[22
]}

Luo, Yunyang ^{[19
]}

Ma, Wenbo ^{[2
]}

Ma, Yugang ^{[8
]}

Mao, Yajun ^{[22
]}

Meng, Yue ^{[2
,3
,4
]}

Ning, Xuyang ^{[2
]}

Pang, Binyu ^{[20
,21
]}

Qi, Ningchun ^{[4
,5
]}

Qian, Zhicheng ^{[2
]}

Ren, Xiangxiang ^{[20
,21
]}

Shan, Dong ^{[16
]}

Shang, Xiaofeng ^{[2
]}

Shao, Xiyuan ^{[16
]}

机构：

[1] New Cornerstone Science Laboratory, Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai,201210, China

[2] School of Physics and Astronomy, Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology, MoE, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai,200240, China

[3] Shanghai Jiao Tong University, Sichuan Research Institute, Chengdu,610213, China

[4] Jinping Deep Underground Frontier Science and Dark Matter, Key Laboratory of Sichuan Province, China

[5] Yalong River Hydropower Development Company Ltd., 288 Shuanglin Road, Chengdu,610051, China

[6] Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai,519082, China

[7] Department of Physics, Yantai University, Yantai,264005, China

[8] Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai,200433, China

[9] School of Physics, Beihang University, Beijing,102206, China

[10] Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing,100191, China

[11] International Research Center for Nuclei and Particles in the Cosmos, Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing,100191, China

[12] Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou,516000, China

[13] SJTU, Paris Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai,200240, China

[14] School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai,200240, China

[15] Department of Physics, University of Maryland, College Park,MD,20742, United States

[16] School of Physics, Nankai University, Tianjin,300071, China

[17] School of Physics, Sun Yat-Sen University, Guangzhou,510275, China

[18] State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei,230026, China

[19] Department of Modern Physics, University of Science and Technology of China, Hefei,230026, China

[20] Research Center for Particle Science and Technology, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao,266237, China

[21] Key Laboratory of Particle Physics and Particle Irradiation, Ministry of Education, Shandong University, Qingdao,266237, China

[22] School of Physics, Peking University, Beijing,100871, China

[23] College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu,610059, China

[24] School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai,519082, China

来源：

Physical Review Letters | 2024年 / 133卷 / 19期

关键词：

The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar B8 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·year are collected for the paired and US2; respectively. After unblinding; 3 and 332 events are observed with an expectation of 2.8±0.5 and 251±32 background events; for the paired and US2 data; respectively. A combined analysis yields a best-fit B8 neutrino signal of 3.5 (75) events from the paired (US2) data sample; with; ∼37%; uncertainty; and the background-only hypothesis is disfavored at 2.64σ significance. This gives a solar B8 neutrino flux of (8.4±3.1)×106 cm-2 s-1; consistent with the standard solar model prediction. It is also the first indication of solar B8 neutrino fogin a dark matter direct detection experiment. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title; journal citation; and DOI. Funded by SCOAP3;

D O I：

10.1103/PhysRevLett.133.191001

中图分类号：

学科分类号：

摘要：

引用

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