DOUBLE PAIR PRODUCTION BY ULTRA-HIGH-ENERGY COSMIC RAY PHOTONS
Demidov S.V., Kalashev O.E.

Received: December 22, 2008

PACS: 13.85.Tp, 96.50.sh, 96.50.sb

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Using the CompHEP package, we provide a detailed estimate of the influence of double e⁺e^- pair production (DPP) by photons on the propagation of ultra-high-energy electromagnetic cascades. We show that in the models where the cosmic ray photon energy reaches a few 10³ EeV, a refined DPP analysis may lead to a substantial difference in the predicted photon spectrum compared to the previous rough estimates.