Matter Traversed by Low-Energy Cosmic-Ray Nuclei in Space

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Scientific paper

The amount of matter traversed in space by the primary cosmic-ray nuclei of energy 50-150, 200-500, 500-1000, and >1500 MeV/nucleon are obtained as 5.5+/-1.4, 9.1+/-0.9, 5.3+/-0.5, and 3.1+/-0.4 g cm-2 of hydrogen, respectively, using recent measurements of spallation cross sections with proton beams from accelerators and LiM ratios of cosmic-ray nuclei (where M denotes nuclei with 6<=Z<=9). These results and other evidence seem to suggest the hypothesis of two distinct sources (or propagation paths) of cosmicray nuclei, one responsible for nuclei of energy roughly 50-150 MeV/nucleon and the other of energies greater than this.

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