Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ap%26ss..30..417k&link_type=abstract
Astrophysics and Space Science, vol. 30, Oct. 1974, p. 417-431. Research supported by the Statens Naturvetenskapliga Forskningsr
Astronomy and Astrophysics
Astrophysics
10
Abundance, Atomic Excitations, Interstellar Matter, Ionization Cross Sections, Primary Cosmic Rays, Solar System, Chemical Composition, Electron Energy, Electron Impact, Heavy Nuclei, Ionization Potentials, Particle Collisions
Scientific paper
The composition of the primordial cosmic radiation has been compared with the solar system composition and that of interstellar matter. It is found that the overabundance of an element in the radiation is approximately proportional to the cross section for the ionization of neutral atoms of that element through fast charged particle impacts. The results strongly support the assumption that the selection of cosmic ray particles is governed by the atomic properties of the elements.
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