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  • Letter
  • Open Access

Measurement of reactor antineutrino flux and spectrum at RENO

S. G. Yoon1, H. Seo2, Z. Atif3, J. H. Choi4, H. I. Jang5, J. S. Jang6, S. H. Jeon7, K. K. Joo3, K. Ju1 et al. (RENO Collaboration)

K. Ju1, D. E. Jung7, J. G. Kim7, J. H. Kim7, J. Y. Kim3, S. B. Kim7, S. Y. Kim2, W. Kim8, E. Kwon7, D. H. Lee7, H. G. Lee2, I. T. Lim3, D. H. Moon3, M. Y. Pac4, J. W. Seo7, C. D. Shin3, B. S. Yang2, J. Yoo2, I. S. Yeo3, and I. Yu7 (RENO Collaboration)

  • 1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
  • 2Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
  • 3Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
  • 4Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
  • 5Department of Fire Safety, Seoyeong University, Gwangju 61268, Korea
  • 6GIST College, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
  • 7Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
  • 8Department of Physics, Kyungpook National University, Daegu 41566, Korea

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Phys. Rev. D 104, L111301 – Published 9 December, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L111301

Abstract

The RENO experiment reports measured flux and energy spectrum of reactor electron antineutrinos ν¯e from the six reactors at Hanbit Nuclear Power Plant. The measurements use 966 094 116 111ν¯e candidate events with a background fraction of 2.39% (5.13%), acquired in the near (far) detector, from August 2011 to March 2020. The inverse beta decay (IBD) yield is measured as (5.852±0.094)×10−43  cm2/fission, corresponding to 0.941±0.015 of the prediction by the Huber and Mueller (HM) model. A reactor ν¯e spectrum is obtained by unfolding a measured IBD prompt spectrum. The obtained neutrino spectrum shows a clear excess around 6 MeV relative to the HM prediction. The obtained reactor ν¯e spectrum will be useful for understanding unknown neutrino properties and reactor models. The observed discrepancies suggest the next round of precision measurements and modification of the current reactor ν¯e models.

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Phys. Rev. D 104, L111301– Published 9 December, 2021
  • Received 29 October 2020
  • Revised 21 January 2021
  • Accepted 2 November 2021
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