Cosmic-ray transport simulation using PHITS

Sato, Tatsuhiko   

Cosmic-rays can generate a number of secondary particles by causing nuclear reactions in the atmosphere, and induce particle cascade so-called airshower. Precise simulation of airshower is of great importance for various purposes such as estimate of cosmic-ray doses for aircrews and public, evaluation of soft-error rates induced by cosmic-ray neutrons, and analysis of correlation between the atmospheric ionization rates and the Earth's environment. Developments of accurate nuclear reaction models and nuclear data libraries are the key issues in the airshower simulation. The results of airshower simulation performed by PHITS will be introduced in this presentation, together with how they have been used in the practical applications.