The Revision of Cumulative Spectra of Beta Particles from \({}^{235}\)U, \({}^{239}\)Pu, and \({}^{238}\)U Fission Products Based on the Updated Measurements of the Ratio of Spectra \({}^{235}\text{U}/{}^{239}\)Pu

Abstract

Based on new measurements of the ratio of cumulative spectra of \(\beta\) particles fission products \({}^{235}\text{U}/{}^{239}\)Pu performed at the National Research Centre Kurchatov Institute (KI), the cumulative spectra of \(\beta\) particles fission products of \({}^{235}\)U, \({}^{239}\)Pu, and \({}^{238}\)U isotopes are updated. The presented spectra of \(\beta\)-particles \({}^{235}\)U and \({}^{239}\)Pu of KI are compared with similar spectra measured at the Institute Laue–Langevin (ILL), and the spectrum of \(\beta\) particles fission products \({}^{238}\)U of KI are compared with the measurements performed at the Technical University of Munich (TUM). It is shown that the ILL ratio of spectra of \(\beta\)-particles \({}^{235}\)U/\({}^{239}\)Pu is mistakenly overestimated by \({\approx}5.4\%\).