The evaluation of experimental data in fast range for n + ⁵⁶Fe(n,inl)

¹ China Nuclear Data Center, Science and Technology on Nuclear Data Laboratory, China Institute of Atomic Energy, PO Box 275(41) Beijing, 102413, P.R. China
² National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000, USA

^a e-mail: qianj@ciae.ac.cn

Published online: 13 September 2017

Abstract

Iron is one of the five materials selected for evaluation within the pilot international evaluation project CIELO. Analysis of experimental data for n+⁵⁶Fe reaction is the basis for constraining theoretical calculations and eventual creation of the evaluated file. The detail analysis was performed for inelastic cross sections of neutron induced reactions with ⁵⁶Fe in the fast range up to 20 MeV where there are significant differences among the main evaluated libraries, mainly caused by the different inelastic scattering cross section measurements. Gamma-ray production cross sections provide a way to gain experimental information about the inelastic cross section. Large discrepancies between experimental data for the 847-keV gamma ray produced in the ⁵⁶Fe(n,n₁'γ) reaction were analyzed. In addition, experimental data for elastic scattering cross section between 9.41∼11 MeV were used to deduce the inelastic cross section from the unitarity constrain.