New56Fe Evaluation for the CIELO project

G P A Nobre,D Brown,Y Danon,L Leal,R Capote,Jing Qian,A Plompen,Tingjin Liu,Xichao Ruan,Zhigang Ge,M Herman,A Trkov,Hnalin Lu

doi:10.1051/epjconf/201611103001

Abstract

The Collaborative International Evaluated Library Organisation (CIELO) aims to provide revised and updated evaluations for Pu-239, U-238,U-235, Fe-56, O-16, and H-1 through international collaboration. This work, which is part of the CIELO project, presents the initial results for the evaluation of the Fe-56 isotope, with neutron-incident energy ranging from 0 to 20 MeV. The Fe-56(n,p) cross sections were fitted to reproduce the ones from IRDFF dosimetry file. Our preliminary file provides good cross-section agreements for the main angle-integrated reactions, as well as a reasonable overall agreement for angular distributions and double-differential spectra, when compared to previous evaluations.

Highlights

The Collaborative International Evaluated Library Organisation (CIELO) is a pilot project from Subgroup 40 of the Working Party on International Nuclear Data Evaluation Co-operation (WPEC SG40)
Integrated cross sections: Up to 846 keV, which is the threshold for the first inelastic state, the evaluated file consists of fitted resonance parameters
Angular distributions: The angular distributions for incident energies lying within the resonance region and up to 846 keV are taken from JENDL-4.0 [2]

Summary

Introduction

The Collaborative International Evaluated Library Organisation (CIELO) is a pilot project from Subgroup 40 of the Working Party on International Nuclear Data Evaluation Co-operation (WPEC SG40). Its main goal is to test the scheme of a broad international collaboration to produce new evaluated nuclear reaction data files. For this purpose evaluators from across the world will re-evaluate all the six main nuclides for reactor applications: 239Pu, 238,235U, 56Fe, 16O, and 1H. There is a great amount of experimental data for 56Fe and for NatFe, of which 91.72% consists of the mass-56 isotope. To perform this evaluation we referred to careful reviews and previous evaluations, such as Refs.

Models adopted

Selection of level-density model

Angular distributions

Conclusions