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Contribution of isobaric analog resonance to (p,n) spectra at intermediate energies

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

Particle transport simulation codes such as PHITS have been used for calculation of radiation shielding in accelerator facilities. In PHITS, INCL describes proton-induced nuclear reactions at intermediate energies of several 100 MeV. Calculated results by the models can reproduce the neutron spectra very well. However, it was pointed out that the calculated results at forward angles underestimate the experimental data in the neutron spectra of lower energies than incident energies by several 10 MeV. In this study, we developed a resonance cross section model considering Isobaric Analog and Gamow Teller resonances on the basis of Evaluated Nuclear Structure Data File (ENSDF). By summing up the result of the model and that of INCL, PHITS can reproduce the experimental data of the proton-induced reaction on Lead targets very well. It is expected that PHITS with the new model gives high accurate results in the calculation of the radiation shielding.

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