DPA calculations for proton and heavy ion incident reactions in wide-energy region using the PHITS code

Iwamoto, Yosuke   ; Niita, Koji*; Sawai, Tomotsugu; Ronningen, R. M.*; Baumann, T.*

The DPA (Displacement per Atom) model in the Particle and Heavy Ion Transport code System (PHITS) has recently been developed using Coulomb scattering to evaluate the energy of target PKA's created by the projectile and the secondary from nuclear reactions. We compared PHITS results for the 130 MeV/u Ge and proton into W reactions with calculated results of TRIM, which is widely used but does not include nuclear reactions. PHITS gives good agreements with TRIM results for DPA values by PKA's created directly by the projectile such as Ge and proton. On the other hands, for the proton incident reaction, PKA's created by the secondary particles is more dominant than PKA's by the projectile itself in DPA calculations. Therefore, TRIM leads to sever underestimation where projectile energy is high enough to create nuclear reactions. PHITS is more reliable code than TRIM for DPA calculations, especially in the high-energy region and proton incidence.