在 RENO 测量反应堆反中微子振荡幅度和频率。
Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO.
机构信息
Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea.
Institute for High Energy Physics, Dongshin University, Naju 58245, Korea.
出版信息
Phys Rev Lett. 2018 Nov 16;121(20):201801. doi: 10.1103/PhysRevLett.121.201801.
The RENO experiment reports more precisely measured values of θ_{13} and |Δm_{ee}^{2}| using ∼2200 live days of data. The amplitude and frequency of reactor electron antineutrino (ν[over ¯]{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) ν[over ¯]{e} candidate events with a background fraction of 4.8% (2.0%). A clear energy and baseline dependent disappearance of reactor ν[over ¯]{e} is observed in the deficit of the measured number of ν[over ¯]{e}. Based on the measured far-to-near ratio of prompt spectra, we obtain sin^{2}2θ_{13}=0.0896±0.0048(stat)±0.0047(syst) and |Δm_{ee}^{2}|=[2.68±0.12(stat)±0.07(syst)]×10^{-3} eV^{2}.
RENO 实验报告了更精确测量的 θ_{13} 和 |Δm_{ee}^{2}| 值，使用了约 2200 个有效数据天。通过比较从两个相同的近距和远距探测器获得的瞬变信号谱，测量了反应堆电子反中微子（ν[over ¯]{e}）的幅度和频率。在 2011 年 8 月至 2018 年 2 月期间，远（近）探测器观察到 103212（850666）个 ν[over ¯]{e}候选事件，背景分数为 4.8%（2.0%）。在测量的 ν[over ¯]{e}数量的缺失中，观察到了明显的与能量和基线相关的反应堆 ν[over ¯]{e}消失。基于测量的瞬变谱的远距-近距比值，我们得到 sin^{2}2θ_{13}=0.0896±0.0048(stat)±0.0047(syst) 和 |Δm_{ee}^{2}|=[2.68±0.12(stat)±0.07(syst)]×10^{-3} eV^{2}。
Zotero 插件