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  • Joint Measurement of the ^{235}U Antineutrino Spectrum by PROSPECT and STEREO
    Almazán, H; Andriamirado, M; Balantekin, A B; Band, H R; Bass, C D; Bergeron, D E; Bernard, L; Blanchet, A; Bonhomme, A; Bowden, N S; Bryan, C D; Buck, C; Classen, T; Conant, A J; Deichert, G; Del Amo Sanchez, P; Delgado, A; Diwan, M V; Dolinski, M J; El Atmani, I; Erickson, A; Foust, B T; Gaison, J K; Galindo-Uribarri, A; Gilbert, C E; Hans, S; Hansell, A B; Heeger, K M; Heffron, B; Jaffe, D E; Jayakumar, S; Ji, X; Jones, D C; Koblanski, J; Kyzylova, O; Labit, L; Lamblin, J; Lane, C E; Langford, T J; LaRosa, J; Letourneau, A; Lhuillier, D; Licciardi, M; Lindner, M; Littlejohn, B R; Lu, X; Maricic, J; Materna, T; Mendenhall, M P; Meyer, A M; Milincic, R; Mueller, P E; Mumm, H P; Napolitano, J; Neilson, R; Nikkel, J A; Nour, S; Palomino, J L; Pessard, H; Pushin, D A; Qian, X; Réal, J-S; Ricol, J-S; Roca, C; Rogly, R; Rosero, R; Salagnac, T; Savu, V; Schoppmann, S; Searles, M; Sergeyeva, V; Soldner, T; Stutz, A; Surukuchi, P T; Tyra, M A; Varner, R L; Venegas-Vargas, D; Vialat, M; Weatherly, P B; White, C; Wilhelmi, J; Woolverton, A; Yeh, M; Zhang, C; Zhang, X

    Physical review letters, 2022-Feb-25, Volume: 128, Issue: 8
    Journal Article

    The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U 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 χ^{2}/ndf=24.1/21, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This νover ¯_{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 χ^{2} value is improved, corresponding to a 2.4σ significance.

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