Abstract

A MAIN objective of current theories of the galactic origin of cosmic radiation has been to explain the observed nuclear composition in terms of a source composition and spallation processes occurring during the propagation from the sources to the Solar System. The so-called leaky-box model can explain the observed composition only if the cosmic rays are assumed to escape from the galaxy after having traversed a few g cm−2 of interstellar gas, but has trouble explaining the flux of primaries of large airshowers. These very energetic nuclei are then assumed to be of extragalactic origin, as our own Galaxy cannot contain them long enough to build up the flux to the observed value and to assure even a moderate degree of isotropy.

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