Neutron-Induced Data Evaluation for Selected Fission Products

概要

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The neutron-induced cross section data for 19 high-priority fission products were evaluated in the fast energy region using the following models: spherical and deformed optical model, multi-step compound and direct (MSC and MSD), pre-equilibrium exiton and Hauser-Feshbach models with a width fluctuation. The calculations were compared to recently measured data and to currently evaluated files. The results in the fast energy region were converted into the ENDF-6 format and merged with the evaluated resonance part. For consistency, the background was included with the merging energy region. The nuclear data set involves the (n, tot), (n, n), (n, n′), (n, 2n), (n, 3n), (n, nα), (n, np), (n, γ), (n, p), and (n, α) cross sections from the thermal to 20 MeV energy range. The results showed good agreement with the measured data. A considerable improvement was achieved for most reactions and nuclei. Format and physics checking codes were applied to each full data set and the NJOY code was used to perform a processing check on the individual cross sections.
2008-06-01