Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay
Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay
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大亚湾电子反中微子振荡幅度和频率的光谱测量
DOI：
10.1103/physrevlett.112.061801
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发表时间：
2014-02-10
影响因子：
8.6
通讯作者：
Zou, J. H.
中科院分区：
文献类型：
--
作者：
An, F. P.;Balantekin, A. B.;Zou, J. H.
报道了在大亚湾反应堆中微子实验中测量反中微子消失与能量的关系。用6个探测器探测了6个2.9GW（th）反应堆的电子反中微子（（v）/bar（e）），探测器布置在两个近（有效基线512和561 m）和一个远（1579 m）的地下实验霍尔斯。使用217天的数据，41 589（203 809和92 912）反中微子候选人被发现在远厅（近霍尔斯）。振幅sin（2）2 θ（13）= 0.090的改进测量（-0.009）（+0.008）和第一次直接测量的（v）超过棒（e）质量平方差垂直棒Δ m（ee）（2）垂直棒=（2.59（-0.20）（+0.19）× 10（-3）eV（2））是在一个三中微子框架中利用观察到的（v）对bar（e）的速率和能谱得到的。垂直棒Delta m（ee）（2）垂直棒eej的这个值与μ子中微子消失测量的垂直棒Delta m（mu mu）（2）垂直棒一致，支持三味振荡模型。
A measurement of the energy dependence of antineutrino disappearance at the Daya Bay reactor neutrino experiment is reported. Electron antineutrinos ((v) over bar (e)) from six 2.9 GW(th) reactors were detected with six detectors deployed in two near (effective baselines 512 and 561 m) and one far (1579 m) underground experimental halls. Using 217 days of data, 41 589 (203 809 and 92 912) antineutrino candidates were detected in the far hall (near halls). An improved measurement of the oscillation amplitude sin(2) 2 theta(13) = 0.090(-0.009)(+0.008) and the first direct measurement of the (v) over bar (e) mass-squared difference vertical bar Delta m(ee)(2)vertical bar = (2.59(-0.20)(+0.19) x 10(-3) eV(2)) is obtained using the observed (v) over bar (e) rates and energy spectra in a three-neutrino framework. This value of vertical bar Delta m(ee)(2)vertical bar eejis consistent with vertical bar Delta m(mu mu)(2)vertical bar measured by muon neutrino disappearance, supporting the three-flavor oscillation model.