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Report No.
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Development of photon-induced pion production in the PHITS Code

Noda, Shusaku; Hashimoto, Shintaro  ; Sato, Tatsuhiko   ; Niita, Koji*

It is of great importance to estimate the dose of secondarily generated protons and neutrons by photonuclear reaction. The Particle and Heavy Ion Transport code System (PHITS) used to be able to treat photonuclear reactions only up to 150 MeV because giant-dipole resonance and quasideuteron reaction were considered. When a high energy photon above 150 MeV induces photonuclear reaction with nucleus, nucleon resonance is produced followed by pion production. In this research, pion-production total cross section for every nucleus is determined using the systematics considering nuclear medium effect and shadowing effect of each nucleus. The process of pion production such as resonance and its decay is simulated, and subsequently emitted pion(s) and proton/neutron are transported in the JQMD model of the PHITS code. As a benchmark test the PHITS calculation results are compared with the experimental data of photon-incident proton/neutron-emission cross sections.

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