Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO
Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO
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DOI：
10.1103/physrevlett.121.201801
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发表时间：
2018-11-15
影响因子：
8.6
通讯作者：
Yu, I.
中科院分区：
文献类型：
--
作者：
Bak, G.;Choi, J. H.;Yu, I.
里诺实验使用类似于2200个活日的数据更精确地报告了θ（13）和竖线Delta m（ee）（2）竖线的测量值。通过比较由两个相同的近、远探测器获得的瞬发信号谱，测量了反应堆电子反中微子（（nu）over bar（e））振荡的振幅和频率。在2011年8月至2018年2月期间，远（近）探测器观测到103 212（850 666）（nu）条（e）候选事件，背景分数为4.8%（2.0%）。在（nu）相对于bar（e）的测量数量的赤字中观察到反应器（nu）相对于bar（e）的明显的能量和基线依赖性消失。根据瞬发光谱的远近比，我们得到sin（2）2 θ（13）= 0.0896 +/- 0.0048（stat）+/- 0.0047（syst）和竖线Δ m（ee）（2）竖线= [2.68 +/- 0.12（stat）+/- 0.07（syst）] × 10（-3）eV（2）。
The RENO experiment reports more precisely measured values of theta(13) and vertical bar Delta m(ee)(2)vertical bar using similar to 2200 live days of data. The amplitude and frequency of reactor electron antineutrino ((nu) over bar (e)) oscillation are measured by comparing the prompt signal spectra obtained from two identical near and far detectors. In the period between August 2011 and February 2018, the far (near) detector observed 103 212 (850 666) (nu) over bar (e) candidate events with a background fraction of 4.8% (2.0%). A clear energy and baseline dependent disappearance of reactor (nu) over bar (e) is observed in the deficit of the measured number of (nu) over bar (e). Based on the measured far-to-near ratio of prompt spectra, we obtain sin(2)2 theta(13) = 0.0896 +/- 0.0048(stat) +/- 0.0047(syst) and vertical bar Delta m(ee)(2)vertical bar = [2.68 +/- 0.12(stat) +/- 0.07(syst)] x 10(-3) eV(2).