nelastic nucleus-nucleus (N-N) cross section is one of the most important physical parameters of
an Extensive Air Shower (EAS) development. Value of this parameter was measured in past with relatively big uncertainty by few ground-based cosmic ray experiments up to 95 TeV in c.m.s. For simulation of EAS development at Ultra High Energy Cosmic Rays (UHECR)it is necessary to extrapolate N-N cross-section using phenomenological models.
In this work we present results of calculations of N-N cross section using few approaches including some approximations of the exact Glauber theory. For calculation we used new parameterization of the hadronic matter distribution in the geometrical model with "BEL behaviour" of proton. Used obtained by us recently model based on the LHC data up to 8 TeV contains four free energy-dependent parameters.
Finally, we present comparison of results of N-N cross-section calculations using various methods and their comparison with experimental data.