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This Week at Physics

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Event Number 2645

  Thursday, April 12th, 2012

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Observation of Reactor Antineutrino Disappearance at RENO
Time: 2:30 pm
Place: 4274 Chamberlin Hall
Speaker: Soo-Bong Kim, Seoul National University
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 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 5.5% (2.7%). A ratio of observed to expected number of antineutrinos in the far detector is 0.920+-0.009(stat.)+-0.014(syst.). From the deficit, we find sin^2(2theta_13)=0.113+-0.013(stat.)+-0.019(syst,) based on a rate-only analysis. In this talk, its detailed analysis will be presented.
Host: Karsten Heeger
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