Soo-Bong Kim for RENO collaboration
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.
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http://arxiv.org/abs/1204.0626
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