Abstract
The evaluation of the 56Fe neutron induced reactions is currently ongoing at the CEA-Cadarache using the code CONRAD, with the goal to cover the whole energy range from the Resolved Resonance Region to the continuum and estimate the corresponding uncertainties and covariance matrices. Some first results and issues occurred from this work are presented and discussed here, more specifically on the analysed transmission and capture data in the Resolved Resonance Region, as well as the optical and statistical model calculations in the fast neutron energy range.
Highlights
Iron is one of the most commonly used structural material in nuclear technology applications, the proper evaluation of all the reaction cross sections for this isotope is fundamental for the accurate modelisation of the reactors
Various issues were found at the existing evaluations which lead to the inclusion of this isotope in the Collaborative International Evaluated Library Organization (CIELO) project [1]
A new evaluation of 56Fe is in progress at the CEA - Cadarache with the code CONRAD [2, 3] in order to solve problems identified in the Resolved Resonance Range (RRR) and in the “continuum” part of the neutron induced cross sections
Summary
Iron is one of the most commonly used structural material in nuclear technology applications, the proper evaluation of all the reaction cross sections for this isotope is fundamental for the accurate modelisation of the reactors. The complexity of the evaluation of this isotope lies into two factors. It is strongly dependent on the evaluation of the minor isotopes (54Fe, 57Fe, 58Fe). There is a strong fluctuating behavior of the cross section data persisting up to several MeV, which neither the present Resolved Resonance Range (RRR) evaluation methodology nor the continuum models are able to properly describe. Some first results from this work are presented in this contribution, from the evaluation of the transmission and capture measurements in the resolved resonance range and from the optical model and statistical model calculations in the continuum range
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