Energy Loss of High-Energy Cosmic Rays in Pair-Producing Collisions with Ambient Photons

Details Energy Loss of High-Energy Cosmic Rays in Pair-Producing Collisions with Ambient Photons Energy Loss of High-Energy Cosmic Rays in Pair-Producing Collisions with Ambient Photons

Mar 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970phrvd...1.1596b&link_type=abstract

Physical Review D, vol. 1, Issue 6, pp. 1596-1602

Mathematics

Logic

105

Scientific paper

General and essentially exact formulas for the energy-loss process A+γ-->A+e++e- are given for high-energy cosmic-ray nuclei traversing an isotropic radiation field of arbitrary energy spectrum. These formulas are obtained by integrating the appropriate differential cross section in the rest frame of the cosmic-ray particle. Results are then given for the case of a Planckian photon distribution at arbitrary temperature. The effect of this energy loss on a universal flux of cosmic rays is then investigated along with the possibility that the observed "knee" at high energies is due to pair production. Finally, the energy-loss formula is applied to quasistellar objects, and it is shown that if these objects are at cosmological distances, they are opaque to particles above a certain energy which depends upon the size of the object.

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