ZhETF, Vol. 135,
p. 878 (May 2009)
(English translation - JETP,
Vol. 108, No. 5,
available online at www.springer.com
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
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.