Gamma-Hadron Separation at High Energies in View of Recent Cross Section Measurements

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Rays, Extensive Air Showers, Cross Sections

Scientific paper

Recent measurements of the cross section for hadron photoproduction at HERA are reviewed and their importance for gamma ray astronomy is outlined. Various methods of distinguishing gamma and hadron primaries among cosmic rays in the air shower range are then discussed in view of our (insufficient) knowledge of the relevant hadron hadron cross sections. Theoretical model calculations indicate that the fraction of proton primaries mimicking gamma rays may be as high as one in a thousand.

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