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  • Letter
  • Open Access

Search for sterile neutrino oscillations using RENO and NEOS data

Z. Atif1, J. H. Choi2, B. Y. Han3, C. H. Jang4, H. I. Jang5, J. S. Jang6, E. J. Jeon7, S. H. Jeon8, K. K. Joo1 et al. (RENO and NEOS Collaborations)

K. K. Joo1, K. Ju9, D. E. Jung8, B. R. Kim1, H. J. Kim10, H. S. Kim11, J. G. Kim8, J. H. Kim8, J. Y. Kim11, J. Y. Kim1, S. B. Kim8, S. Y. Kim12, W. Kim10, Y. D. Kim7,13, Y. J. Ko7, E. Kwon8, D. H. Lee12, H. G. Lee12, J. Lee7, J. Y. Lee10, M. H. Lee7,13, I. T. Lim1, D. H. Moon1, Y. M. Oh7, M. Y. Pac2, H. K. Park14, H. S. Park15, J. S. Park10, K. S. Park7, R. G. Park1, H. Seo12, J. W. Seo8, K. M. Seo11, C. D. Shin1, K. Siyeon4, G. M. Sun3, B. S. Yang12, I. S. Yeo5, J. Yoo12, S. G. Yoon12, and I. Yu8 (RENO and NEOS Collaborations)

  • 1Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
  • 2Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
  • 3HANARO Utilization Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea
  • 4Department of Physics, Chung-Ang University, Seoul 06974, Korea
  • 5Department of Fire Safety, Seoyeong University, Gwangju 61268, Korea
  • 6GIST College, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
  • 7Center for Underground Physics, Institute for Basic Science (IBS), Daejeon 34126, Korea
  • 8Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
  • 9Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
  • 10Department of Physics, Kyungpook National University, Daegu 41566, Korea
  • 11Department of Physics and Astronomy, Sejong University, Seoul 05006, Korea
  • 12Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
  • 13IBS School, University of Science and Technology (UST), Daejeon, 34113, Korea
  • 14Department of Accelerator Science, Korea University, Sejong 30019, Korea
  • 15Korea Research Institute of Standards and Science, Daejeon 34113, Korea

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Phys. Rev. D 105, L111101 – Published 8 June, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L111101

Abstract

We present a nearly reactor model independent search for sterile neutrino oscillation using 2 509 days of RENO near detector data and 180 days of NEOS data. The reactor related systematic uncertainties are significantly suppressed as both detectors are located at the same reactor complex of Hanbit Nuclear Power Plant. The search is performed by electron antineutrino (ν¯e) disappearance between six reactors and two detectors with flux-weighted baselines of 419 m (RENO) and 24 m (NEOS). A spectral comparison of the NEOS prompt-energy spectrum with a no-oscillation prediction from the RENO measurement can explore reactor ν¯e oscillations to sterile neutrino. Based on the comparison, we obtain a 95% C.L. excluded region of 0.1<|Δm412|<7  eV2. We also obtain a 68% C.L. allowed region with the best fit of |Δm412|=2.41  eV2 and sin22θ14=0.08 having a p-value of 8.2%. Comparisons of obtained reactor antineutrino spectra at reactor sources are made among RENO, NEOS, and Daya Bay to find a possible spectral variation.

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Phys. Rev. D 105, L111101– Published 8 June, 2022
  • Received 23 July 2021
  • Revised 6 February 2022
  • Accepted 10 May 2022
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