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Upper limit on the ultrahigh-energy photon flux from AGASA and Yakutsk data
2006
Physical Review D
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We present the interpretation of the muon and scintillation signals of ultra-high-energy air showers observed by AGASA and Yakutsk extensive air shower array experiments. We consider case-by-case ten highest energy events with known muon content and conclude that at the 95% confidence level (C.L.) none of them was induced by a primary photon. Taking into account statistical fluctuations and differences in the energy estimation of proton and photon primaries, we derive an upper limit of 36% at
doi:10.1103/physrevd.73.063009
fatcat:t4c644ajsbe7fejjmljl6pr5hm