PHITS: Particle and Heavy Ion Transport code System, Version 2.23

Niita, Koji*; Matsuda, Norihiro  ; Iwamoto, Yosuke   ; Iwase, Hiroshi*; Sato, Tatsuhiko   ; Nakashima, Hiroshi; Sakamoto, Yukio; Sihver, L.*

The Particle and Heavy-Ion Transport code System PHITS has been developed under the collaboration of JAEA, RIST and KEK, as an upgraded version of the NMTC/JAM code developed. PHITS can deal with the transport of all particles and heavy ions over wide energy ranges, using several nuclear reaction models and nuclear data libraries. The geometrical configuration of the simulation can be setup by GG (General Geometry) or CG (Combinatorial Geometry). Various quantities such as heat, track length and production yields can be deduced from the simulation, using implemented estimator functions called "tally". The code also has a function to draw 2D figures of the calculated results as well as the setup geometries, using ANGEL. Owing to these features, PHITS has been widely used for various purposes such as designs of accelerator shielding, radiation therapy and space exploration. This document provides the manual of PHITS.