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Physics Department, Columbia University, New York, New York 10027, USA.
Nikhef and the University of Groningen, Van Swinderen Institute, 9747AG Groningen, Netherlands.
Phys Rev Lett. 2024 Nov 8;133(19):191002. doi: 10.1103/PhysRevLett.133.191002.
We present the first measurement of nuclear recoils from solar ^{8}B neutrinos via coherent elastic neutrino-nucleus scattering with the XENONnT dark matter experiment. The central detector of XENONnT is a low-background, two-phase time projection chamber with a 5.9 t sensitive liquid xenon target. A blind analysis with an exposure of 3.51 t×yr resulted in 37 observed events above 0.5 keV, with (26.4_{-1.3}^{+1.4}) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of 2.73σ. The measured ^{8}B solar neutrino flux of (4.7_{-2.3}^{+3.6})×10^{6} cm^{-2} s^{-1} is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted CEνNS cross section on Xe of (1.1_{-0.5}^{+0.8})×10^{-39} cm^{2} is consistent with the Standard Model prediction. This is the first direct measurement of nuclear recoils from solar neutrinos with a dark matter detector.
我们通过XENONnT暗物质实验中的相干弹性中微子-核散射，首次测量了来自太阳(^{8}B)中微子的核反冲。XENONnT的中央探测器是一个低本底的两相时间投影室，带有一个5.9吨的灵敏液态氙靶。在3.51吨·年的曝光量下进行的盲分析，在0.5 keV以上观测到37个事例，背景预期为(26.4({-1.3}^{+1.4}))个事例。仅背景假设在2.73σ的统计显著性水平下被拒绝。测得的太阳(^{8}B)中微子通量为(4.7({-2.3}^{+3.6}))×10(^{6})厘米(^{-2})秒(^{-1})，与萨德伯里中微子观测站的结果一致。测得的氙上中微子通量加权的相干弹性中微子-核散射截面为(1.1(_{-0.5}^{+0.8}))×10(^{-39})厘米(^{2})，与标准模型预测一致。这是首次使用暗物质探测器对来自太阳中微子的核反冲进行直接测量。
