3. Effective cross-section processing

To be usable in radiation propagation codes, effective cross-sections must undergo physical, numerical and computer processing. This depends on the nature of the information stored in the evaluations, the nature of the physical problem studied and the numerical methods implemented in the transport codes used. For example, the effective cross-sections used by Monte Carlo particle propagation codes are generally point-like in energy, i.e. described by pairs of values [E, σ (E)] where E is the energy of the incident neutron. Deterministic transport codes (discrete ordinate method/S _N , finite elements...)