Physics – Nuclear Physics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7526964p&link_type=abstract
Unknown
Physics
Nuclear Physics
Cosmic Rays, High Energy Interactions, Photonuclear Reactions, Astrophysics, Energy Dissipation, Evolution (Development), Galactic Radiation, Monte Carlo Method, Nuclei (Nuclear Physics), Radiation Spectra
Scientific paper
Results of detailed Monte Carlo calculations of the interaction histories of ultrahigh energy cosmic-ray nuclei with intergalactic radiation fields are presented. Estimates of these fields and empirical determinations of photonuclear cross sections are used, including multinuclear disintegrations for nuclei up to 56Fe. Intergalactic and galactic energy loss rates and nucleon loss rates for nuclei up to 56Fe are also given. Astrophysical implications are discussed in terms of expected features in the cosmic-ray spectrum between quintillion and sextillion eV for the universal and supercluster origin hypotheses. The results of these calculations indicate that ultrahigh energy cosmic rays cannot be universal in origin regardless of whether they are protons or nuclei. Both the supercluster and galactic origin hypotheses, however, are possible regardless of nuclear composition.
Bredekamp J. H.
Puget Jean-Loop
Stecker Floyd W.
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