Photon air showers at ultra-high energy and the photonuclear cross-section

  title={Photon air showers at ultra-high energy and the photonuclear cross-section},
  author={Markus Risse and Piotr Homola and Ralph Engel and Dariusz G{\'o}ra and D. Heck and Jan Pekala and Barbara Wilczynska and Henryk Wilczynski},
  journal={Czechoslovak Journal of Physics},
Experimental conclusions from air shower observations on cosmic-ray photons above 1019 eV are based on the comparison to detailed shower simulations. For the calculations, the photonuclear cross-section needs to be extrapolated over several orders of magnitude in energy. The uncertainty from the cross-section extrapolation translates into an uncertainty of the predicted shower features for primary photons and, thus, into uncertainties for a possible data interpretation. After briefly reviewing… Expand

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