Observation of coherent elastic neutrino-nucleus scattering
Observation of coherent elastic neutrino-nucleus scattering
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DOI：
10.1126/science.aao0990
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发表时间：
2017-09-15
期刊：
影响因子：
56.9
通讯作者：
Zderic, A. M.
中科院分区：
文献类型：
--
作者：
Akimov, D.;Albert, J. B.;Zderic, A. M.
40年来，中微子与原子核的相干弹性散射一直没有被探测到，尽管它的预测截面是迄今为止所有低能中微子耦合中最大的。这种相互作用模式为研究中微子性质提供了新的机会，并导致探测器尺寸的小型化，具有潜在的技术应用。我们观察到这个过程在6.7秒的置信水平，使用低背景，14.6公斤碘化铯[钠]闪烁体暴露于中微子排放的Sputterus中子源在橡树岭国家实验室。在高信号背景条件下，观察到能量和时间的特征签名，预测该过程的标准模型。改进的约束非标准中微子与夸克的相互作用来自这个初始数据集。
The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross section is by far the largest of all low-energy neutrino couplings. This mode of interaction offers new opportunities to study neutrino properties and leads to a miniaturization of detector size, with potential technological applications. We observed this process at a 6.7s confidence level, using a low-background, 14.6-kilogram CsI[Na] scintillator exposed to the neutrino emissions from the Spallation Neutron Source at Oak Ridge National Laboratory. Characteristic signatures in energy and time, predicted by the standard model for this process, were observed in high signal-to-background conditions. Improved constraints on nonstandard neutrino interactions with quarks are derived from this initial data set.