Observation of Electron-Antineutrino Disappearance at Daya Bay
Observation of Electron-Antineutrino Disappearance at Daya Bay
复制标题
大亚湾电子反中微子消失观测
DOI：
10.1103/physrevlett.108.171803
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发表时间：
2012-04-23
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.;Bai, J. Z.;Zou, J. H.
大亚湾反应堆中微子实验以5.2倍标准偏差的显著性测量出中微子混合角θ13为非零值。在两个近厅（通量加权基线分别为470米和576米）和一个远厅（1648米）的地下实验厅中部署的六个反中微子探测器探测到了来自六个2.9吉瓦（热功率）反应堆的反中微子。在55天内，4.3万吨 - 吉瓦（热功率） - 天的有效运行时间里，在远厅（近厅）探测到10416（80376）个电子反中微子候选事例。远厅观测到的反中微子数量与预期数量之比为R = 0.940 ± 0.011（统计误差）± 0.004（系统误差）。仅基于事例率的分析在三味中微子框架下得出sin²2θ13 = 0.092 ± 0.016（统计误差）± 0.005（系统误差）。
The Daya Bay Reactor Neutrino Experiment has measured a nonzero value for the neutrino mixing angle 0(13) with a significance of 5.2 standard deviations. Antineutrinos from six 2.9 GW(th) reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With a 43 000 ton-GW(th)-day live-time exposure in 55 days, 10 416 (80 376) electron-antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is R = 0.940 +/- 0.011(stat.) +/- 0.004(syst.). A rate-only analysis finds sin(2)2 theta(13) = 0.092 +/- 0.016(stat.) +/- 0.005(syst.) in a three-neutrino framework.