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New approach to description of ($$d$$,$$xn$$) spectra at energies below 50 MeV in Monte Carlo simulation by intra-nuclear cascade code with distorted wave born approximation

Hashimoto, Shintaro  ; Iwamoto, Yosuke   ; Sato, Tatsuhiko   ; Niita, Koji*; Boudard, A.*; Cugnon, J.*; David, J.-C.*; Leray, S.*; Mancusi, D.*

Recently, accelerator-based neutron sources have been considered for scientific research and medical applications, where deuteron-induced reactions of Li, Be, or C targets at low ($$<$$50 MeV) incident energies are essential to produce high-intensity neutron beams. Description of the reactions in simulations of particle transport are required to estimate dose distributions. In this study, we developed a new method that combines the Intra-Nuclear Cascade of Li$`e$ge (INCL) and Distorted Wave Born Approximation (DWBA), and incorporated it into the Particle and Heavy Ion Transport code System (PHITS). A proton-stripping process and transitions between discrete states of nuclei are considered in the method by INCL and DWBA, respectively. We applied the method to reproduce neutron spectra in the reactions on thin and thick targets. Results obtained by PHITS with the method successfully agreed with experimental data, which were not reproduced by the old model.

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