The age parameter of ultrahigh-energy cosmic gamma-ray showers

Details The age parameter of ultrahigh-energy cosmic gamma-ray showers The age parameter of ultrahigh-energy cosmic gamma-ray showers

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ncimc..11..193c&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 11 C, Mar.-Apr. 1988, p. 193-204.

Physics

1

Cosmic Ray Showers, Gamma Rays, Radiation Distribution, Cygnus Constellation, Monte Carlo Method, Nucleons, Photons

Scientific paper

The lateral-age parameter of EAS as a possible parameter for distinguishing between photonic- and nucleonic-initiated showers is investigated by Monte Carlo simulation. Contrary to what has been assumed by many workers in the past, it is found that gamma-ray-initiated showers tend to be younger at most observing levels, with the difference being outside experimental resolution at sea level. This makes it difficult to understand some reported directional excesses of ultrahigh-energy cosmic-rays as arising from primary gamma-rays.

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