Verification of the Energy Dependence of the GEF Code Fission Product Yields Using Delayed Neutron Temporary Data

Abstract

The purpose of this work is to extend the energy range of the data on the relative abundances and the periods of delayed neutrons from fission of 235 U beyond the threshold of the 235 U(n,n'f) reaction. The measurements of the relative abundances and half-lives of precursors for delayed neutrons emitted from neutron-induced fission of 235 U in the energy range 0.4 -8 MeV have been performed with a modified experimental setup at IPPE, Obninsk. The obtained data have been used to verify the energy dependence of the 235 U fission product yields obtained from the GEF code using the summation method and the IAEA microscopic delayed-neutron database. The delayed-neutron relative abundances and half-lives data for neutron-induced fission of 235 U in the energy range 0.4 -8 MeV are available from the IAEA reference database https://wwwnds.iaea.org/beta-delayed-neutron/database.html.