Prospects for Improved Understanding of Isotopic Reactor Antineutrino Fluxes

Abstract

Predictions of antineutrino fluxes produced by fission isotopes in a nuclear reactor have recently received increased scrutiny due to observed differences in predicted and measured inverse beta decay (IBD) yields, referred to as the 'reactor antineutrino flux anomaly.' In this paper, global fits are applied to existing IBD yield measurements to produce constraints on antineutrino production by individual plutonium and uranium fission isotopes. We find that fits including measurements from highly 235U-enriched cores and fits including Daya Bay's new fuel evolution result produce discrepant best-fit IBD yields for 235U and 239Pu. This discrepancy can be alleviated in a global analysis of all datasets through simultaneous fitting of 239Pu, 235U, and 238U yields. The measured IBD yield of U238 in this analysis is (7.02 +/- 1.65) x 10^-43 cm2/fission, nearly two standard deviations below existing predictions. Future hypothetical IBD yield measurements by short-baseline reactor experiments are examined to determine their possible impact on global understanding of isotopic IBD yields. It is found that future improved short-baseline IBD yield measurements at both high-enriched and low-enriched cores can significantly improve constraints for 235U, 238U, and 239Pu, providing comparable or superior precision to existing conversion- and summation-based antineutrino flux predictions. Systematic and experimental requirements for these future measurements are also investigated.

arXiv comment11 Pages, 3 Figures, 4 Tables

References in corpus (41)

• First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
• Observation of electron-antineutrino disappearance at Daya Bay
• Observation of Reactor Electron Antineutrino Disappearance in the RENO Experiment
• The Reactor Antineutrino Anomaly
• Limits on Neutrino Oscillations from the CHOOZ Experiment
• Neutrino Physics with JUNO
• Improved Predictions of Reactor Antineutrino Spectra
• On the determination of anti-neutrino spectra from nuclear reactors
• Sterile Neutrino Oscillations: The Global Picture
• Sterile neutrino search at NEOS Experiment
• Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Measurement of Neutrino-Electron Scattering Cross-Section with a CsI(Tl) Scintillating Crystal Array at the Kuo-Sheng Nuclear Power Reactor
• Systematic Uncertainties in the Analysis of the Reactor Neutrino Anomaly
• Updated Global 3+1 Analysis of Short-BaseLine Neutrino Oscillations
• Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment
• Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Improved measurements of the neutrino mixing angle ${\theta }_{13}$ with the Double Chooz detector
• Pragmatic View of Short-Baseline Neutrino Oscillations
• New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products
• Spectral Structure of Electron Antineutrinos from Nuclear Reactors
• Improved Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Experimental Determination of the Antineutrino Spectrum of the Fission Products of ${}^{238}$U
• The Possible Origin and Implications of the Shoulder in Reactor Neutrino Spectra
• Online Monitoring of the Osiris Reactor with the Nucifer Neutrino Detector
• New Results from RENO and The 5 MeV Excess
• Improved Calculation of Thermal Fission Energy
• The 5 MeV bump - a nuclear whodunit mystery
• Results of the engineering run of the Coherent Neutrino Nucleus Interaction Experiment (CONNIE)
• The PROSPECT Physics Program
• A novel segmented-scintillator antineutrino detector
• Reactor Antineutrino Anomaly with known θ_{13}
• Reactor Fuel Fraction Information on the Antineutrino Anomaly
• Investigating the Spectral Anomaly with Different Reactor Antineutrino Experiments
• Precise Determination of the U-235 Reactor Antineutrino Cross Section per Fission
• Conversion of electron spectrum associated with fission into the antineutrino spectrum
• Experimental Parameters for a Reactor Antineutrino Experiment at Very Short Baselines
• Antineutrino-Deuteron Experiment at Krasnoyrsk
• Improved Determination of the ${}^{235}\text{U}$ and ${}^{239}\text{Pu}$ Reactor Antineutrino Cross Sections per Fission
• Determining reactor fuel type from continuous antineutrino monitoring
• Experiment Neutrino-4 and restrictions for sterile neutrino
• Precise Determination of the U-235 Reactor Antineutrino Cross Section per Fission

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• Model-Independent ${\bar{\nu }}_e$ Short-Baseline Oscillations from Reactor Spectral Ratios
• Fuel-composition dependent reactor antineutrino yield at RENO
• Extraction of the ${}^{235}$U and ${}^{239}$Pu Antineutrino Spectra at Daya Bay
• Sterile Neutrinos and the Global Reactor Antineutrino Dataset
• Measurement of the Antineutrino Spectrum from ${}^{235}$U Fission at HFIR with PROSPECT
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