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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 $R={{}^{e}S}_{5}/{{}^{e}S}_{9}$ between cumulative $\beta$ spectra from ${}^{235}\mathrm{U}$ and ${}^{239}\mathrm{Pu}$, performed at a research reactor in National Research Centre Kurchatov Institute (KI). A discrepancy with the $\beta$ 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 ${}^{235}\mathrm{U}$ and ${}^{239}\mathrm{Pu}$: ${\left(}^{5}{\sigma }_{f}{/}^{9}{\sigma }_{f}{\right)}_{KI}=1.45±0.03$, and then we reevaluate the converted antineutrino spectra for ${}^{235}\mathrm{U}$ and ${}^{238}\mathrm{U}$. We conclude that the new predictions are consistent with the results of Daya Bay and STEREO experiments.