Simple leaky box model for cosmic-ray propagation, models for production of antiprotons at ultrahigh energies and the estimations of the $$\bar p/p$$ ratiosratios

Abstract

Accepting the simple leaky box model as the basis for propagation of cosmic rays, the problematical \(\bar p/p\) ratio has been estimated theoretically by applying two versions of antiproton production models. The results have been compared with those from the experiments as well as from some other empirio-theoretical models. It has been emphatically pointed out that even within the premises of the simple leaky box model the discrepancies can be removed only by taking into account the contributions from the large-p T antiproton production cross-sections and the role of theA-dependence of nuclear cross-sections in a much more pronounced way.