Determination of antineutrino spectra from nuclear reactors

In this paper we study the effect of well-known higher-order corrections to the allowed $\ensuremath{\beta}$-decay spectrum on the determination of antineutrino spectra resulting from the decays of fission fragments. In particular, we try to estimate the associated theory errors and find that induced currents like weak magnetism may ultimately limit our ability to improve the current accuracy and under certain circumstance could even greatly increase the theoretical errors. We also perform a critical evaluation of the errors associated with our method to extract the antineutrino spectrum using synthetic $\ensuremath{\beta}$ spectra. It turns out that a fit using only virtual $\ensuremath{\beta}$ branches with…

• UD
  U.S. Department of Energy

  Award: DE-SC0003915