Abstract
AN important measurement of the composition of cosmic ray nuclei at high energy (20<E<100 GeV nucleon−1) has been reported by Juliusson, Meyer and Müller1. They show that the ratio of galactic secondary nuclei to primary nuclei decreases very steeply when the energy of the observed nuclei is above 30 GeV nucleon−1. The ratio of predominantly secondary nuclei to predominantly primary nucleiwhich is ∼0.31 at energies of 1.5 GeV/N is found to be 0.23 ± 0.03 at 25 and 30 GeV/N and 0.12+0.05−0.07 at 90 GeV/N. Juliusson et al.1 conclude that this effect may be explained in terms of particle propagation in the Galaxy: the leakage term which describes the probability that galactic cosmic rays leave the Galaxy must be energy dependent. Here we present a quantitative estimation of this dependence and discuss the implications of such a dependence.
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References
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AUDOUZE, J., CESARSKY, C. Mean Path Length of High Energy Galactic Cosmic Rays in the Galactic Disk. Nature Physical Science 241, 98–100 (1973). https://doi.org/10.1038/physci241098a0
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DOI: https://doi.org/10.1038/physci241098a0
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