Improvements and developments of physics models in PHITS for space applications

Sihver, L.*; Sato, Tatsuhiko   ; Hashimoto, Shintaro  ; Ogawa, Tatsuhiko   ; Niita, Koji*

Precise predictions of the radiation environment inside space vehicles, and inside the human body, are essential when planning for long term deep space missions. Upgrading of nuclear reaction models in Particle and Heavy Ion Transport code System (PHITS) was essential for application to radiological protection in space. In this paper, we present some physics models which have been recently improved and developed in PHITS. The items introduced in this paper are improvements of Kurotama Hybrid model, adopting of the Intra-Nuclear Cascade of Liege (INCL) model, development of statistical multi-fragmentation model (SMM) and combining the INCL and the Distorted Wave Born Approximation (DWBA) calculation. The results of verification studies for these models are also presented.