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Two features, a slow slope and a sharp drop, in neutron induced totalnonelastic cross-sections are analyzed within the framework of an intra-nuclearcascade (INC) model. First, to reproduce the slow slope from 100MeV to 10 MeV,the original INC is generalized in two points; a method to construct the groundstate of the target nucleus, and a method of taking the effective two bodycross-sections between two nucleons. Secondly, to analyze the origin of thesharp drop from 10MeV to nearly 1 MeV, the INC is extended to include quantumeffects which are originated from the existence of the discrete states in thenuclear potential. It is shown that this extension leads to the sharp drops inthe very low energy below around 10MeV. It is concluded that the INC model canbe extended to explain the sharp drops in addition to the slow slope in neutroninduced nonelastic cross-sections in the energy region from 100MeV down to 1MeV.

Extension of Intra-Nuclear Cascade Model to Neutron Induced Nonelastic Cross-Sections in Low Energy Region