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The First Observation of Effect of Oscillation in Neutrino-4 Experiment on Search for Sterile Neutrino

  • A. P. SerebrovEmail author
  • V. G. Ivochkin
  • R. M. Samoilov
  • A. K. Fomin
  • A. O. Polyushkin
  • V. G. Zinoviev
  • P. V. Neustroev
  • V. L. Golovtsov
  • A. V. Chernyj
  • O. M. Zherebtsov
  • M. E. Chaikovskii
  • V. P. Martemyanov
  • V. G. Tarasenkov
  • V. I. Aleshin
  • A. L. Petelin
  • A. L. Izhutov
  • A. A. Tuzov
  • S. A. Sazontov
  • M. O. Gromov
  • V. V. Afanasiev
  • M. E. Zaytsev
  • A. A. Gerasimov
  • D. K. Ryazanov
Article

Abstract

We report Neutrino-4 experiment results of measurements of reactor antineutrinos flux and spectrum dependence on the distance in range 6–12m from the center of the reactor core. The fit of experimental dependence with the law 1/L2, where L is the distance from the reactor center, gave satisfactory result with goodness of fit 81 %. However, we discovered that the experimental neutrino spectrum is different from the calculated one. Using experimental spectrum, we performed the model independent analysis of restrictions on oscillation parameters Δm214 and sin2 2θ14. The results of this analysis exclude area of reactor and gallium anomaly at CL more than 99.7% (>3σ) for values Δm214 < 3 eV2 and sin2 2θ14 > 0.1. However, we observed an oscillation effect at CL 2.8σ in vicinity of Δm214 ≈ 7.3 eV2 and sin2 2θ14 ≈ 0.39. The method of coherent addition of results of measurements, which allows us to directly observe the effect of oscillations, is proposed. The analysis of that effect is presented. In general, it seems that the effect predicted in gallium and reactor experiments is being confirmed but at sufficiently large value of Δm214. Future prospects of the experiment are discussed.

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  • A. P. Serebrov
    • 1
    Email author
  • V. G. Ivochkin
    • 1
  • R. M. Samoilov
    • 1
  • A. K. Fomin
    • 1
  • A. O. Polyushkin
    • 1
  • V. G. Zinoviev
    • 1
  • P. V. Neustroev
    • 1
  • V. L. Golovtsov
    • 1
  • A. V. Chernyj
    • 1
  • O. M. Zherebtsov
    • 1
  • M. E. Chaikovskii
    • 1
  • V. P. Martemyanov
    • 2
  • V. G. Tarasenkov
    • 2
  • V. I. Aleshin
    • 2
  • A. L. Petelin
    • 3
  • A. L. Izhutov
    • 3
  • A. A. Tuzov
    • 3
  • S. A. Sazontov
    • 3
  • M. O. Gromov
    • 3
  • V. V. Afanasiev
    • 3
  • M. E. Zaytsev
    • 1
    • 4
  • A. A. Gerasimov
    • 1
  • D. K. Ryazanov
    • 4
  1. 1.National Research Center “Kurchatov Institute” Petersburg Nuclear Physics InstituteGatchinаRussia
  2. 2.National Research Center “Kurchatov Institute”MoscowRussia
  3. 3.Joint-stock company State Science Center Research Institute of Atomic ReactorsDimitrovgradRussia
  4. 4.Dimitrovgrad Engineering and Technological Institute MEPhIDimitrovgradRussia

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