Credits Soo-Bong Kim for RENO collaboration
Observation of Reactor Electron Antineutrino Disappearance in the RENO Experiment
April, 03, 2012
 The RENO experiment has observed the disappearance of reactor electron antineutrinos ...
 The RENO experiment has observed the disappearance of reactor electron antineutrinos, consistent with neutrino oscillations, with a significance of 6.3 standard deviations. Antineutrinos from six 2.8 GW$_{th}$ reactors at Yonggwang Nuclear Power Plant in Korea, are detected by two identical detectors located at 294 m and 1383 m, respectively, from the reactor array center. In the 229 day data-taking period of 11 August 2011 to 26 March 2012, the far (near) detector observed 17102 (154088) electron antineutrino candidate events with a background fraction of 4.9% (2.7%). A ratio of observed to expected number of antineutrinos in the far detector is $0.922 \pm 0.010({\rm stat.}) \pm 0.008({\rm syst.})$. From the deficit, we find $\sin^2 2 \theta_{13} = 0.103 \pm 0.013({\rm stat.}) \pm 0.011({\rm syst.})$ based on a rate-only analysis. \\ ( http://arxiv.org/abs/1204.0626 ,  1541kb)

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