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Observation of Reactor Electron Antineutrinos Disappearance in the RENO Experiment

Authors
Ahn, J. K.Chebotaryov, S.Choi, J. H.Choi, S.Choi, W.Choi, Y.Jang, H. I.Jang, J. S.Jeon, E. J.Jeong, I. S.Joo, K. K.Kim, B. R.Kim, B. C.Kim, H. S.Kim, J. Y.Kim, S. B.Kim, S. H.Kim, S. Y.Kim, W.Kim, Y. D.Lee, J.Lee, J. K.Lim, I. T.Ma, K. J.Pac, M. Y.Park, I. G.Park, J. S.Park, K. S.Shin, J. W.Siyeon, K.Yang, B. S.Yeo, I. S.Yi, S. H.Yu, I.
Issue Date
May-2012
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.108, no.19
Journal Title
PHYSICAL REVIEW LETTERS
Volume
108
Number
19
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/20321
DOI
10.1103/PhysRevLett.108.191802
ISSN
0031-9007
1079-7114
Abstract
The RENO experiment has observed the disappearance of reactor electron antineutrinos, consistent with neutrino oscillations, with a significance of 4.9 standard deviations. Antineutrinos from six 2.8 GW(th) reactors at the Yonggwang Nuclear Power Plant in Korea, are detected by two identical detectors located at 294 and 1383 m, respectively, from the reactor array center. In the 229 d data-taking period between 11 August 2011 and 26 March 2012, the far (near) detector observed 17102 (154088) electron antineutrino candidate events with a background fraction of 5.5% (2.7%). The ratio of observed to expected numbers of antineutrinos in the far detector is 0.920 +/- 0.009(stat) +/- 0.014(syst). From this deficit, we determine sin(2)2 theta(13) = 0.113 +/- 0.013(stat) +/- 0.019(syst) based on a rate-only analysis.
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자연과학대학 (물리학과)
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