Observation of reactor electron antineutrinos disappearance in the RENO experiment

J. K. Ahn, S. Chebotaryov, J. H. Choi, S. Choi, W. Choi, Y. Choi, H. I. Jang, J. S. Jang, E. J. Jeon, I. S. Jeong, K. K. Joo, 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. KimJ. Lee, J. K. Lee, I. T. Lim, K. J. Ma, M. Y. Pac, I. G. Park, J. S. Park, K. S. Park, J. W. Shin, K. Siyeon, B. S. Yang, I. S. Yeo, S. H. Yi, I. Yu

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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 2.8GW 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 sin22θ 13=0.113±0.013(stat)±0.019(syst) based on a rate-only analysis.

Original languageEnglish
Article number191802
JournalPhysical review letters
Volume108
Issue number19
DOIs
Publication statusPublished - 2012 May 11
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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., ... Yu, I. (2012). Observation of reactor electron antineutrinos disappearance in the RENO experiment. Physical review letters, 108(19), [191802]. https://doi.org/10.1103/PhysRevLett.108.191802