Physical basis of the transfort and composition of cosmic rays in the galaxy

Consideration of cosmic-ray propagation leads naturally to an equilibrium model for cosmic-ray origin and storage in the galaxy. In this model the relative abundances of nuclei with substantially different charge values are nearly energy independent. We conclude that this simple, one- "component" model is consistent with observations of both the galactic primary (i.e., H1, He4, C, N, O, Fe) and secondary particles (He3, Li, Be, B).