Accurate Measurement of the Electron Antineutrino Yield of U-235 Fissions from the STEREO Experiment with 119 Days of Reactor-On Data

Abstract

We report a measurement of the antineutrino rate from the fission of U-235 with the STEREO detector using 119 days of reactor turned on. In our analysis, we perform several detailed corrections and achieve the most precise single measurement at reactors with highly enriched U-235 fuel. We measure an IBD cross section per fission of ${\sigma }_f$ = (6.34 $\pm$ 0.06 [stat] $\pm$ 0.15 [sys] $\pm$ 0.15 [model]) $\times$ 10${}^{-43}$ cm${}^2$/fission and observe a rate deficit of (5.2 $\pm$ 0.8 [stat] $\pm$ 2.3 [sys] $\pm$ 2.3 [model])% compared to the model, consistent with the deficit of the world average. Testing U-235 as the sole source of the deficit, we find a tension between the results of lowly and highly enriched U-235 fuel of 2.1 standard deviations.

7 pages, 1 figure

References in corpus (8)

• The Reactor Antineutrino Anomaly
• Sterile neutrino search at NEOS Experiment
• Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes
• Improved Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Improved Sterile Neutrino Constraints from the STEREO Experiment with 179 Days of Reactor-On Data
• Diagnosing the Reactor Antineutrino Anomaly with Global Antineutrino Flux Data
• Precise Determination of the U-235 Reactor Antineutrino Cross Section per Fission
• Production and Properties of the Liquid Scintillators used in the Stereo Reactor Neutrino Experiment

Cited by in corpus (17)

• Sub-percent Precision Measurement of Neutrino Oscillation Parameters with JUNO
• Reevaluating reactor antineutrino spectra with new measurements of the ratio between ${}^{235}$U and ${}^{239}$Pu $\beta$ spectra
• 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
• SoLid: A short baseline reactor neutrino experiment
• First antineutrino energy spectrum from ${}^{235}$U fissions with the STEREO detector at ILL
• First measurement of high-energy reactor antineutrinos at Daya Bay
• Joint Measurement of the ${}^{235}$U Antineutrino Spectrum by Prospect and Stereo
• Reactor antineutrino flux and anomaly
• PROSPECT-II Physics Opportunities
• Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment
• Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors
• Characterization of plastic scintillator bars using fast neutrons from D-D and D-T reactions
• Liquid-organic time projection chamber for detecting low energy antineutrinos
• Exploring Current Constraints on Antineutrino Production by ${}^{241}$Pu and Paths Towards the Precision Reactor Flux Era
• A Decade of Discoveries by the Daya Bay Reactor Neutrino Experiment