Abstract
A thorough discussion of the equilibrium antiproton spectrum prediction for the usual leaky-box model, the closed-galaxy model of Rasmussen and Peters (1975) and the revised closed-galaxy model of Peters and Westergaard (1976) is presented. It is found that the effect of the antiproton non-annihilation inelastic interaction is significant even for the leaky-box model, in that the predicted equilibrium antiproton spectrum does not show a strong low-energy cut-off similar to that existing in the antiproton production spectrum due to kinematic limitations.