Photonuclear interactions of ultrahigh energy cosmic rays and their astrophysical consequences

Details Photonuclear interactions of ultrahigh energy cosmic rays and their astrophysical consequences Photonuclear interactions of ultrahigh energy cosmic rays and their astrophysical consequences

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205..638p&link_type=abstract

Astrophysical Journal, vol. 205, Apr. 15, 1976, pt. 1, p. 638-654.

Astronomy and Astrophysics

Astrophysics

158

Cosmic Rays, High Energy Interactions, Nuclear Reactions, Radiation Effects, Abundance, Energy Dissipation, Heavy Nuclei, Intergalactic Media, Nucleons, Pair Production, Particle Emission

Scientific paper

Results are presented for detailed Monte Carlo calculations of the interaction histories of ultrahigh-energy cosmic-ray nuclei with intergalactic radiation fields, using improved estimates of these fields and empirical determinations of photonuclear cross sections, including multinuclear disintegrations for nuclei up to Fe-56. Intergalactic and galactic energy-loss rates and nucleon-loss rates for nuclei up to Fe-56 are also given. Astrophysical implications are discussed in terms of expected features in the cosmic-ray spectrum between 10 to the 18th and 10 to the 21st power 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.

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