Extragalactic heavy nuclei in cosmic rays

Details Extragalactic heavy nuclei in cosmic rays Extragalactic heavy nuclei in cosmic rays

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jpha....8.1518t&link_type=abstract

Journal of Physics, Part A - Mathematical and General, vol. 8, Sept. 1975, p. 1518-1529. Research supported by the Science Resea

Physics

20

Cosmic Rays, Extraterrestrial Radiation, Heavy Nuclei, Intergalactic Media, Energy Spectra, High Energy Interactions, Protons

Scientific paper

It might be thought that if the energetic particles in the cosmic radiation are of extragalactic origin then they must be protons because heavy nuclei would be completely fragmented by interactions with the radiation fields in space. Here we argue that this is not the case and that it is, in principle, possible to choose an origin model in which the very energetic particles commence their life as heavy nuclei; these nuclei then interact with extragalactic photons and give rise to the observed primary spectrum. Such a model would relate mainly to energies above about 1,000,000 TeV where there is the well known need to postulate extragalactic origin on the grounds of the observed near-isotropy of arrival directions. Specific experimental tests of models of this type are suggested.

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