Cosmic rays of very high energy

Details Cosmic rays of very high energy Cosmic rays of very high energy

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpph...47..655w&link_type=abstract

Reports on Progress in Physics (ISSN 0034-4885), vol. 47, June 1984, p. 655-706.

Physics

9

Cosmic Rays, Energetic Particles, Energy Spectra, High Energy Interactions, Atmospheric Effects, Corpuscular Radiation, Galactic Cosmic Rays, Iron, Propagation Modes, Protons, Virgo Galactic Cluster

Scientific paper

The characteristics of cosmic rays with energies exceeding 100 billion keV are reviewed. A power law expression has been accepted for the energy spectrum up to a trillion keV, followed by a larger exponent up to 10 billion GeV, and then by a flatter spectrum. The actual particle distribution is as yet uncertain. Scaling behavior has been observed to break down in atmospheric scattering events with energies over a billion keV, a concept supported by proton-positron collisions in intersecting ring experiments. The amplitude of the first harmonic of the anisotropy rises with the associated energy, implying that gamma rays with energies over a billion MeV may produce the harmonic. The source of the cosmic rays may be mainly pulsars, SNR and other cataclysmic events up to 10 billion GeV levels. Above that, the sources could be extragalactic, particularly from the Virgo cluster of galaxies.

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