Improvement of intra-nuclear cascade model implemented in PHITS using momentum distribution based on one-particle wave functions

Hashimoto, Shintaro  ; Sato, Tatsuhiko   

Intra-nuclear cascade model INCL implemented in PHITS can describe various processes occurred by proton-induced reactions at energies of between 10MeV and several GeV. However, INCL overestimate experimental data of proton-knockout reactions. It was pointed out that description of momentum distribution of protons at target surfaces in INCL causes the overestimation. In this study, we improved the momentum distribution by using results of Fourier transformation of simple-particle wave functions. We changed only the component of nucleons in the outer core. In the default INCL, the distribution of surface nucleons has a large component in the high-momentum region. On the other hand, introducing the single-particle model decreases the high-momentum component and suppresses the knockout reaction. By this improvement, INCL can reproduce the data very well. It is expected that PHITS with the improved model gives accurate results of the knockout reaction.