Measurement of the B 8 solar neutrino flux in SNO + with very low backgrounds
Measurement of the B 8 solar neutrino flux in SNO + with very low backgrounds
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极低背景下 SNO 中 B 8 太阳中微子通量的测量
DOI：
10.1103/physrevd.99.012012
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发表时间：
2019
影响因子：
5
通讯作者：
Anderson M
中科院分区：
文献类型：
--
作者：
Anderson M
利用该探测器在水试运行阶段获得的69.2千吨/天的数据集测量了太阳中微子通量。在能量超过6 MeV的情况下，数据集是太阳中微子弹性散射事件的非常纯的样本，主要是由于探测器的位置较深，允许在相对较少的曝光下进行准确的测量。在该能量范围内，最佳拟合的背景速率为，显著低于在该能量范围内测量的太阳中微子事件速率，即。同样使用低于这个阈值的数据，低至5 MeV，太阳中微子事件方向的拟合产生了观测到的通量，假设没有中微子振荡。这个速率与物质增强的中微子振荡和其他实验的测量结果是一致的。
A measurement of thesolar neutrino flux has been made using a 69.2 kt-day dataset acquired with thedetector during its water commissioning phase. At energies above 6 MeV the dataset is an extremely pure sample of solar neutrino elastic scattering events, owing primarily to the detector’s deep location, allowing an accurate measurement with relatively little exposure. In that energy region the best fit background rate is, significantly lower than the measured solar neutrino event rate in that energy range, which is. Also using data below this threshold, down to 5 MeV, fits of the solar neutrino event direction yielded an observed flux of, assuming no neutrino oscillations. This rate is consistent with matter enhanced neutrino oscillations and measurements from other experiments.