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Phys Rev Lett. 2018 Nov 16;121(20):201801. doi: 10.1103/PhysRevLett.121.201801.

Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO.

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Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea.
Institute for High Energy Physics, Dongshin University, Naju 58245, Korea.
Department of Fire Safety, Seoyeong University, Gwangju 61268, Korea.
GIST College, Gwangju Institute of Science and Technology, Gwangju 61005, Korea.
Department of Physics, Sungkyunkwan University, Suwon 16419, Korea.
Department of Physics, KAIST, Daejeon 34141, Korea.
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea.
Department of Physics, Kyungpook National University, Daegu 41566, Korea.
Institute for Basic Science, Daejeon 34047, Korea.


The RENO experiment reports more precisely measured values of θ_{13} and |Δm_{ee}^{2}| using ∼2200 live days of data. The amplitude and frequency of reactor electron antineutrino (ν[over ¯]_{e}) oscillation are measured by comparing the prompt signal spectra obtained from two identical near and far detectors. In the period between August 2011 and February 2018, the far (near) detector observed 103 212 (850 666) ν[over ¯]_{e} candidate events with a background fraction of 4.8% (2.0%). A clear energy and baseline dependent disappearance of reactor ν[over ¯]_{e} is observed in the deficit of the measured number of ν[over ¯]_{e}. Based on the measured far-to-near ratio of prompt spectra, we obtain sin^{2}2θ_{13}=0.0896±0.0048(stat)±0.0047(syst) and |Δm_{ee}^{2}|=[2.68±0.12(stat)±0.07(syst)]×10^{-3}  eV^{2}.

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