Reevaluating reactor antineutrino spectra with new measurements of the ratio between ${}^{235}$U and ${}^{239}$Pu $\beta$ spectra

Abstract

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 ${}^{235}$U and ${}^{239}$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 $1.054\pm 0.002$. We find a value of the ratio between inverse beta decay cross section per fission for ${}^{235}$U and ${}^{239}$Pu: ${(}^5{\sigma }_f{/}^9{\sigma }_f{)}_{KI}=1.45\pm 0.03$, and then we reevaluate the converted antineutrino spectra for ${}^{235}$U and ${}^{238}$U. We conclude that the new predictions are consistent with the results of Daya Bay and STEREO experiments.

Added more details on the KI experiment. Corrected the error budget for U-238 in Table 1. Results and conclusions unchanged

References in corpus (5)

• The Reactor Antineutrino Anomaly
• Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes
• Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup
• Accurate Measurement of the Electron Antineutrino Yield of U-235 Fissions from the STEREO Experiment with 119 Days of Reactor-On Data
• Applied Antineutrino Physics 2018 Proceedings

Cited by in corpus (31)

• Reactor antineutrino anomaly in light of recent flux model refinements
• Neutrino Flavor Conversions in High-Density Astrophysical and Cosmological Environments
• Stereo neutrino spectrum of 235U fission rejects sterile neutrino hypothesis
• Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data
• First constraints on light sterile neutrino oscillations from combined appearance and disappearance searches with the MicroBooNE detector
• Large Extra Dimensions and neutrino experiments
• Sterile Neutrino Searches with MicroBooNE: Electron Neutrino Disappearance
• Gallium Anomaly: Critical View from the Global Picture of ${\nu }_e$ and ${\bar{\nu }}_e$ Disappearance
• First measurement of high-energy reactor antineutrinos at Daya Bay
• Final Measurement of the U235 Antineutrino Energy Spectrum with the PROSPECT-I Detector at HFIR
• Two sides of the same coin: sterile neutrinos and dark radiation. Status and perspectives
• Joint Measurement of the ${}^{235}$U Antineutrino Spectrum by Prospect and Stereo
• Reactor antineutrino flux and anomaly
• Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Review of sterile neutrino searches at very short-baseline reactor experiments
• Comprehensive Measurement of the Reactor Antineutrino Spectrum and Flux at Daya Bay
• Neutrino Decoherence and the Mass Hierarchy in the JUNO Experiment
• Future searches for light sterile neutrinos at nuclear reactors
• Long term remote reactor power and fuel composition monitoring using antineutrinos
• Resonant Production of Light Sterile Neutrinos in Compact Binary Merger Remnants
• Baseline and other effects for a sterile neutrino at DUNE
• Model-Independent Determination of Isotopic Cross Sections per Fission for Reactor Antineutrinos
• How to measure the reactor neutrino flux below the inverse beta decay threshold with CE$\nu$NS
• Study of beta spectrum shapes relevant to the prediction of reactor antineutrino spectra
• Sensitivity of Hyper-Kamiokande to sub-eV Sterile Neutrinos
• Directional Response of Several Geometries for Reactor-Neutrino Detectors
• Exploring Current Constraints on Antineutrino Production by ${}^{241}$Pu and Paths Towards the Precision Reactor Flux Era
• Sterile sector impacting the correlations and degeneracies among mixing parameters at the Deep Underground Neutrino Experiment
• Electron-antineutrino spectrum from precision measurements of ${}^{144}$Pr-decay
• Study of $\mathbf{\beta }$ Decay Shape Factors in First-Forbidden Transitions with $\mathbf{\Delta }{\mathbf{I}}^{\mathbf{\pi }}=0^{-}$ for Reactor Antineutrino Spectra Predictions
• Remote Reactor Ranging via Antineutrino Oscillations