Ultra-High Energy γ-Rays from Intergalactic Space

Details Ultra-High Energy γ-Rays from Intergalactic Space Ultra-High Energy γ-Rays from Intergalactic Space

Jul 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963pthph..30...71h&link_type=abstract

Progress of Theoretical Physics, Vol. 30, No. 1, pp. 71-83

Physics

7

Scientific paper

The intensity and the energy spectrum of high energy γ-rays arising from the collisions of cosmic ray protons and thermal photons in the intergalactic space are calculated. The calculation gives the result that the ratio of the frequency of extensive air showers initiated by γ-rays to that of cosmic ray particles is 2 × 10^{-4} for shower sizes greater than 10^6 at mountain altitude and about 10^{-3} at sea level. This calculated value is rather small in this size range, but increases with shower size. For example, it reaches a maximum value, about 5 × 10^{-3} at mountain altitude and about 10^{-2} at sea level for shower sizes greater than 10^7. It is emphasized that our result should be examined by observations of extensive air showers of shower size greater than 10^7, and also that the observations of γ-ray initiated air showers provide useful means of investigating high energy interactions and cosmology.

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