Measurement of the Coherent Elastic Neutrino-Nucleus Scattering Cross Section on CsI by COHERENT
Measurement of the Coherent Elastic Neutrino-Nucleus Scattering Cross Section on CsI by COHERENT
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COHERENT 测量 CsI 相干弹性中微子核散射截面
DOI：
10.1103/physrevlett.129.081801
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发表时间：
2022
影响因子：
8.6
通讯作者：
Bolozdynya, A.
中科院分区：
文献类型：
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作者：
Akimov, D.;An, P.;Awe, C.;Barbeau, P. S.;Becker, B.;Belov, V.;Bernardi, I.;Blackston, M. A.;Bock, C.;Bolozdynya, A.
我们使用 CsI[Na] 闪烁晶体在橡树岭国家实验室散裂中子源产生的高通量中微子中测量了相干弹性中微子核散射 (CEvNS) 的横截面。自从使用该探测器首次观察 CEvNS 以来，在探测器退役之前收集的新数据使数据集增加了一倍多。更新的淬火模型还减少了系统不确定性，从而提高了精度。通过这些分析改进，COHERENT 协作确定了与标准模型一致的横截面，从而提供了迄今为止最精确的 CEvNS 测量。中微子束的计时结构已被用来比较不同中微子味道散射的 CEvNS 横截面。这一结果对中微子非标准相互作用施加了主要限制，同时测试了轻子味道的普遍性并测量了弱混合角 asat。
We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in a high flux of neutrinos produced at the Spallation Neutron Source at Oak Ridge National Laboratory. New data collected before detector decommissioning have more than doubled the dataset since the first observation of CEvNS, achieved with this detector. Systematic uncertainties have also been reduced with an updated quenching model, allowing for improved precision. With these analysis improvements, the COHERENT Collaboration determined the cross section to be, consistent with the standard model, giving the most precise measurement of CEvNS yet. The timing structure of the neutrino beam has been exploited to compare the CEvNS cross section from scattering of different neutrino flavors. This result places leading constraints on neutrino nonstandard interactions while testing lepton flavor universality and measures the weak mixing angle asat.