Neutron Moderation in Fast Reactors in the Presence of Wide Scattering Resonances: Analysis of Methods

An analysis of methods is presented for the treatment of wide scattering resonances in light and intermediate elements of interest for fast reactors. An approximate method, based on the continuous slowing-down theory, is shown to be in good agreement with the most refined methods; this method is suggested for further use in both the self-shielding factors and the intermediate-energy-group strategies for cross-section generation currently under development.