Upper limit to the diffuse cosmic ultrahigh-energy γ spectrum

Details Upper limit to the diffuse cosmic ultrahigh-energy γ spectrum Upper limit to the diffuse cosmic ultrahigh-energy γ spectrum

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvd..44.2635h&link_type=abstract

Physical Review D (Particles and Fields), Volume 44, Issue 9, 1 November 1991, pp.R2635-R2639

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Scientific paper

An upper limit to the difuse cosmic ultrahigh-energy (UHE) γ spectrum from ~5 TeV up to ~1 PeV is inferred from data on the spectrum of the electromagnetic component of secondary cosmic rays recorded by emulsion-chamber experiments at various atmospheric depths. Our Monte Carlo simulation of the atmospheric propagation and interaction of the photons and protons with primary energies of (5×1012)-1015 eV shows that the intensity of uncorrelated γ events with visible energies Eγ=5-100 TeV observed in emulsion-chamber experiments is sensitive to the diffuse cosmic UHE γ rays at the level of ~10-3 compared to primary cosmic rays in the same energy region, depending on the atmospheric depth of the observation level. We also discuss the relevance of the UHE γ spectrum to topics such as diffuse photons as by-products of the energy loss of extragalactic cosmic rays interacting with the cosmic 2.7 K background radiation, direct photons as a result of possible new production mechanisms, and photons as products of radiative decay of unstable cosmological relic neutrinos of mass ~5 TeV-1 PeV.

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