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Dissecting Reactor Antineutrino Flux Calculations.

A A Sonzogni1, E A McCutchan1, A C Hayes2

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Accurate antineutrino predictions require precise electron spectra from nuclear fission. A +6% MeV-1 shape correction improves Daya Bay data, but more fission product measurements are crucial for confirming the reactor neutrino anomaly.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Reactor Physics

Background:

  • Current reactor antineutrino yield and spectra predictions depend on experimental electron spectra and numerical conversion methods.
  • Discrepancies exist between measured antineutrino spectra (Daya Bay) and theoretical models (Huber-Mueller).

Purpose of the Study:

  • Quantitatively investigate assumptions in electron-to-antineutrino conversion methods.
  • Explore reasons for the disagreement in antineutrino spectra measurements.
  • Assess the impact of fission product contributions and conversion parameters.

Main Methods:

  • Compare two recent approaches for calculating electron and antineutrino spectra.
  • Investigate the influence of ^{238}U contribution, effective charge, and allowed shape assumptions.
  • Analyze the Daya Bay antineutrino spectrum with a focus on shape corrections.

Main Results:

  • A shape correction of approximately +6% MeV^{-1} in conversion calculations improves agreement with the Daya Bay spectrum.
  • The inclusion of this correction is plausible due to a lack of experimental data.
  • The ^{238}U contribution and other conversion assumptions are explored as potential sources of spectral discrepancies.

Conclusions:

  • Precisely measured electron spectra for approximately 50 relevant fission products are essential for confirming and quantifying the reactor neutrino anomaly.
  • Future measurements of shape factors for these nuclides, leveraging existing beta intensity data, are highly desirable.
  • New rare ion facilities can facilitate these crucial measurements.