2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186607The accuracy of the procedure that converts the experimentally determined electron spectrum associated with fission of the nuclear fuels ^{235}U, ^{239}Pu, ^{241}Pu, and ^{238}U into the $\barν_e$ spectrum is examined. By using calculated sets of mutually consistent spectra it is shown that the conversion procedure can result in a small $\sim$1% error provided several conditions are met. Chief among them are the requirements that the average nuclear charge <Z> as a function of the $β$ decay endpoint energy is independently known and that the $\barν_e$ spectrum is binned into bins that are several times larger than the width of the slices used to fit the electron spectrum.Accepted for publication in Phys. Rev. CHigh Energy Physics - Phenomenologytext