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Is the cosmic ray source composition energy dependent at high energy?

Use has been made of the non-homogeneous diffusive model of cosmic ray propagation described by Le Guet and Pacheco (1973) and modified by Le Guet and Stanton (1974) to calculate the cosmic ray source composition at 50 GeV/n. It is assumed to be energy independent in order to predict the cosmic ray abundances at the top of the Earth's atmosphere for different energies in the range 2.5-50 GeV/n. The conclusion arrived at is that the assumption of constant source composition is consistent with the observations and the nuclear data presently available in the energy range considered.