Joint Measurement of the U235 Antineutrino Spectrum by PROSPECT and STEREO

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Abstract
The PROSPECT and STEREO collaborations present a combined measurement of the pure U235 antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with χ2/ndf=24.1/21, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This ν¯e energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5–6 MeV region. When a Gaussian bump is fitted to the excess, the data-model χ2 value is improved, corresponding to a 2.4σ significance.
Funding Information
  • Agence Nationale de la Recherche (ANR-13-BS05-0007)
  • Commissariat á l’Énergie Atomique et aux Énergies Alternatives
  • Centre National de la Recherche Scientifique
  • Institut National de Physique Nucléaire et de Physique des Particules
  • Max-Planck-Gesellschaft
  • U.S. Department of Energy (DE-SC0016357, DE-SC0017660, DE-SC0017815, DE-SC0008347, DE-SC0016060, DE-SC0012704, DE-AC52-07NA27344, DE-AC05-00OR22725)
  • Office of Science
  • High Energy Physics
  • Yale University
  • Drexel University
  • Illinois Institute of Technology
  • Temple University
  • Brookhaven National Laboratory (SCW1504)
  • Lawrence Livermore National Laboratory
  • Oak Ridge National Laboratory
  • Heising-Simons Foundation (2016-117)
  • Canada First Research Excellence Fund
  • Natural Sciences and Engineering Research Council of Canada (RGPIN-418579)
  • National Institute of Standards and Technology
  • Province of Ontario

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