TY - JOUR
T1 - First Indication of Solar B 8 Neutrinos through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T
AU - (PandaX Collaboration)
AU - Bo, Zihao
AU - Chen, Wei
AU - Chen, Xun
AU - Chen, Yunhua
AU - Cheng, Zhaokan
AU - Cui, Xiangyi
AU - Fan, Yingjie
AU - Fang, Deqing
AU - Gao, Zhixing
AU - Geng, Lisheng
AU - Giboni, Karl
AU - Guo, Xunan
AU - Guo, Xuyuan
AU - Guo, Zichao
AU - Han, Chencheng
AU - Han, Ke
AU - He, Changda
AU - He, Jinrong
AU - Huang, Di
AU - Huang, Houqi
AU - Huang, Junting
AU - Hou, Ruquan
AU - Hou, Yu
AU - Ji, Xiangdong
AU - Ji, Xiangpan
AU - Ju, Yonglin
AU - Li, Chenxiang
AU - Li, Jiafu
AU - Li, Mingchuan
AU - Li, Shuaijie
AU - Li, Tao
AU - Li, Zhiyuan
AU - Lin, Qing
AU - Liu, Jianglai
AU - Lu, Congcong
AU - Lu, Xiaoying
AU - Luo, Lingyin
AU - Luo, Yunyang
AU - Ma, Wenbo
AU - Ma, Yugang
AU - Mao, Yajun
AU - Meng, Yue
AU - Ning, Xuyang
AU - Pang, Binyu
AU - Qi, Ningchun
AU - Qian, Zhicheng
AU - Ren, Xiangxiang
AU - Shan, Dong
AU - Shang, Xiaofeng
AU - Zhou, Xiaopeng
N1 - Publisher Copyright:
© 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.
PY - 2024/11/8
Y1 - 2024/11/8
N2 - 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 "fog"in a dark matter direct detection experiment.
AB - 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 "fog"in a dark matter direct detection experiment.
UR - https://www.scopus.com/pages/publications/85210549180
U2 - 10.1103/PhysRevLett.133.191001
DO - 10.1103/PhysRevLett.133.191001
M3 - 文章
C2 - 39576898
AN - SCOPUS:85210549180
SN - 0031-9007
VL - 133
JO - Physical Review Letters
JF - Physical Review Letters
IS - 19
M1 - 191001
ER -