Analysis of multi-fragmentation reactions induced by relativistic heavy ions using the statistical multi-fragmentation model

Ogawa, Tatsuhiko   ; Sato, Tatsuhiko   ; Hashimoto, Shintaro  ; Niita, Koji*

The fragmentation cross-sections of relativistic-energy nucleus-nucleus collisions were analyzed by SMM (Statistical Multi-fragmentation Model) incorporated with the Monte-Carlo radiation transport simulation code PHITS (Particle and Heavy Ion Transport code System). Comparison with literature data shows PHITS-SMM reproduces fragmentation cross-sections of heavy nuclei in relativistic-energies better than PHITS by up to two orders of magnitude. It is also found that SMM does not degrade neutron production cross-sections in heavy ion collisions or fragmentation cross-sections of light nuclei, for which SMM have not been benchmarked. Therefore, SMM is a robust model to supplement conventional nucleus-nucleus reaction models for more accurate prediction of fragmentation cross-sections.