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Accurate Measurement of the Electron Antineutrino Yield of U235 Fissions from the STEREO Experiment with 119 Days of Reactor-On Data

H. Almazán1,*, L. Bernard2,†, A. Blanchet3,‡, A. Bonhomme1,3, C. Buck1, P. del Amo Sanchez4, I. El Atmani3,§, J. Haser1, L. Labit4 et al. (STEREO Collaboration)

L. Labit4, J. Lamblin2, A. Letourneau3,∥, D. Lhuillier3, M. Licciardi2, M. Lindner1, T. Materna3, A. Minotti3,¶, A. Onillon3, H. Pessard4, J.-S. Réal2, C. Roca1, R. Rogly3, T. Salagnac2,**, V. Savu3, S. Schoppmann1,††, V. Sergeyeva4,‡‡, T. Soldner5, A. Stutz2, and M. Vialat5 (STEREO Collaboration)

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

  • *Present address: Donostia International Physics Center, Paseo Manuel Lardizabal, 4, 20018 Donostia-San Sebastian, Spain.
  • †Present address: Ecole Polytechnique, CNRS/IN2P3, Laboratoire Leprince-Ringuet, 91128 Palaiseau, France.
  • ‡Present address: LPNHE, Sorbonne Université, Université de Paris, CNRS/IN2P3, 75005 Paris, France.
  • §Present address: Hassan II University, Faculty of Sciences, Aïn Chock, BP 5366 Maarif, Casablanca 20100, Morocco.
  • ∥alain.letourneau@cea.fr
  • Present address: Dipartimento di Fisica e Scienze della Terra, University of Ferrara and INFN, 44122 Ferrara, Italy.
  • **Present address: Institut de Physique Nucléaire de Lyon, CNRS/IN2P3, Université Lyon, Université Lyon 1, 69622 Villeurbanne, France.
  • ††stefan.schoppmann@mpi-hd.mpg.de
  • ‡‡Present address: Institut de Physique Nucléaire Orsay, CNRS/IN2P3, 15 rue Georges Clemenceau, 91406 Orsay, France.
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Phys. Rev. Lett. 125, 201801 – Published 10 November, 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.201801

Abstract

We report a measurement of the antineutrino rate from the fission of U235 with the STEREO detector using 119 days of reactor turned on. In our analysis, we perform several detailed corrections and achieve the most precise single measurement at reactors with highly enriched U235 fuel. We measure an IBD cross section per fission of σf=(6.34±0.06[stat]±0.15[sys]±0.15[model])×10−43  cm2/fission and observe a rate deficit of (5.2±0.8[stat]±2.3[sys]±2.3[model])% compared to the model, consistent with the deficit of the world average. Testing U235 as the sole source of the deficit, we find a tension between the results of lowly and highly enriched U235 fuel of 2.1 standard deviations.

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Outline

Information

Phys. Rev. Lett. 125, 201801– Published 10 November, 2020
  • Received 9 April 2020
  • Revised 6 August 2020
  • Accepted 28 September 2020
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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