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Reevaluating reactor antineutrino spectra with new measurements of the ratio betweenU235andPu239βspectra
Physical Review D  (IF5.296),  Pub Date : 2021-10-25, DOI: 10.1103/physrevd.104.l071301
V. Kopeikin, M. Skorokhvatov, O. Titov

We report a reanalysis of the reactor antineutrino energy spectra based on the new relative measurements of the ratio R=Se5/Se9 between cumulative β spectra from U235 and Pu239, performed at a research reactor in National Research Centre Kurchatov Institute (KI). A discrepancy with the β spectra measured at Institut Laue-Langevin (ILL) was observed, indicating a steady excess of the ILL ratio by the factor of 1.054±0.002. We find a value of the ratio between inverse beta decay cross section per fission for U235 and Pu239: (5σf/9σf)KI=1.45±0.03, and then we reevaluate the converted antineutrino spectra for U235 and U238. We conclude that the new predictions are consistent with the results of Daya Bay and STEREO experiments.