Multistep Description of Nucleon Production Spectra in Nucleon-Induced Reactions at Intermediate Energy

The Tamura-Udagawa-Lenske (TUL) formulation of the multistep direct (MSD) reaction approach to the pre-equilibrium processes is reviewed. It takes into account consistently the coherent and the statistical aspects of such processes. We also show calculations of neutron-induced charge exchange reactions at 100 MeV, an energy region of great interest in applications to accelerator-driven systems.