Extensive air showers accompanied by γ-ray families with JEγ,H>=10 TeV and general extensive air showers

Details Extensive air showers accompanied by γ-ray families with JEγ,H>=10 TeV and general extensive air showers Extensive air showers accompanied by γ-ray families with JEγ,H>=10 TeV and general extensive air showers

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvd..39.1267f&link_type=abstract

Physical Review D (Particles and Fields), Volume 39, Issue 5, 1 March 1989, pp.1267-1274

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Scientific paper

Extensive air showers (EAS's) accompanied by families of high-energy cascade showers were observed at Mt. Norikura (738 g cm-2). 99 families of γ-ray- and hadron-origin showers with total energies JEγ,H>=10 TeV were obtained. The success rate of the combination between families and EAS's reaches to almost 90% (87 events). The families are associated with young EAS's, with mean age parameter s~0.7, whose sizes distribute widely over three orders of magnitude up to 108. The size spectrum of the family-associated EAS's coincides with the general EAS's in the size region above 5×106 but the former drops rapidly from the latter below this critical size. From the absolute intensity of JEγ,H spectrum the proton fraction in the primary cosmic rays is deduced to be (14+/-5)%, with an error of one standard deviation, in the primary energies (5×1014)-1016 eV, in comparison with a Monte Carlo simulation assuming an adequate interaction model. This agrees with the result obtained by the work with other mountain data and is also compatible with the result inferred from the size spectrum gap between the family-associated EAS's and the general EAS's in the region below the critical size.

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