Application of the Fermi Model to Cosmic-Ray Events of Primary Energy Greater Than1013ev

Abstract
The Fermi model for nucleon-nucleon collisions at high energies has been used to calculate the energy distribution, the energy dependence of the angular distribution, and the number of emitted pions as a function of primary energy and impact parameter. We calculate the effect on the pion distribution of nucleon-antinucleon production in the same collision. The results approach agreement with air-shower observations.