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Sterile Neutrino Constraints from the STEREO Experiment with 66 Days of Reactor-On Data

H. Almazán1, P. del Amo Sanchez2, L. Bernard3, A. Blanchet4, A. Bonhomme4, C. Buck1, J. Favier2, J. Haser1, V. Hélaine3 et al. (STEREO Collaboration)

V. Hélaine3, F. Kandzia5, S. Kox3, J. Lamblin3,*, A. Letourneau4, D. Lhuillier4,†, M. Lindner1, L. Manzanillas2, T. Materna4, A. Minotti4, F. Montanet3, H. Pessard2, J.-S. Real3, C. Roca1, T. Salagnac3, S. Schoppmann1, V. Sergeyeva2, T. Soldner5,‡, A. Stutz3, and S. Zsoldos3 (STEREO Collaboration)

  • 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
  • 2Univ. Grenoble Alpes, Université Savoie Mont Blanc, CNRS/IN2P3, LAPP, 74000 Annecy, France
  • 3Univ. Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France
  • 4IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
  • 5Institut Laue-Langevin, CS 20156, 38042 Grenoble Cedex 9, France

  • *jacob.lamblin@lpsc.in2p3.fr
  • †david.lhuillier@cea.fr
  • ‡soldner@ill.fr
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Phys. Rev. Lett. 121, 161801 – Published 17 October, 2018

DOI: https://doi.org/10.1103/PhysRevLett.121.161801

Abstract

The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5% C.L.

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Phys. Rev. Lett. 121, 161801– Published 17 October, 2018
  • Received 7 June 2018
  • Revised 14 August 2018
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