33RD INTERNATIONAL COSMIC RAY CONFERENCE, RIO DE JANEIRO 2013 THE ASTROPARTICLE PHYSICS CONFERENCE Collimation of energetic neutrinos and muons inside EAS cores

Abstract: Detailed simulations of EAS have been carried out with CORSIKA program in order to evaluate the energy brought by different shower components at ground level and transmitted underground. A special attention is given to the angular distributions and to the collimation of beams penetrating deep underground or underwater. The natural collimation of high energy particles in EAS cores results mainly from the ratio between the transverse and the longitudinal momenta of secondary particles generated in the earliest interactions. This collimation is partly conserved by high energy muons and neutrinos. In the case of high energy muons, we study the effect of the geomagnetic field and observe a clear separation between charge and negative particles in the case of inclined EAS. Those last results are obtained with the curved option of CORSIKA