In order to observe in cosmic rays properties helpful for a future exploration of the Earth, we have performed simulations intended to identify inside the EAS cores the natural conditions of collimation of pion beams able to replace the magnetic focusing. This work is focused on neutrino and muon component of Extensive Air Shower generated by proton and iron primary particles with energy range from 10
5 to 10
9 GeV. Only neutrinos and muons close to the shower axis (cores radius less than 10 m) are taken into account. Simulations were carried out using CORSIKA program (Heck et al 1998) coupled to the hadronic interaction model QGSJET.
we have observed:
1- The penetrating EAS component (muons and neutrinos) around the shower axis present some features that could be correlated to the characteristics of the primary interactions.
é- The most interesting quantities for this purpose are the multiplicity and the lateral and energy distributions of the muons and the neutrinos.