Triple-humped fission barrier model for a new U-238 neutron cross-section evaluation and first validations

A new neutron-induced cross-section evaluation of U-238 from 1 keV up to 200 MeV has been performed using only nuclear reactions models. A new fission penetrability model taking into account a triple humped barrier has been developed. A clear improvement has been observed for K-effective validation tests (up to 30 MeV) with this new evaluation. This improvement is mainly due to a better treatment of the inelastic exit channel. (C) 2004 Elsevier Ltd. All rights reserved.