The impact of photonuclear reaction models on propagation of ultrahigh energy cosmic rays

Photodisintegration is a main process of energy losses of ultrahigh energy cosmic ray (UHECR) nuclei at the highest energies when UHECR nuclei propagate in intergalactic space. Therefore, the model dependence of the photodisintegration is important in the intepretation of experimental data. We calculated photonuclear reactions of 27 stable nuclei with nuclear-density functional theory (DFT) using the random-phase approximation (RPA) and three interaction models. We implemented the results in a public cosmic-ray propagation code CRPropa and simulated cosmic-ray propagation from extragalactic sources. We present the comparison of the simulated energy spectra between the models.