One-group cross-sections

The solution of the diffusion equation (3.24) requires that the one-group cross-sections be known. Some of the most important fission and capture cross-sections for heavy nuclei are given in tables 3.1 and 3.2. Table 3.1 gives the cross-sections for a PWR spectrum while table 3.2 gives the cross-sections for a fast reactor of the Superphenix type.