Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 401: Kosmische Strahlung III

T 401.1: Vortrag

Donnerstag, 8. März 2007, 16:45–17:00, INF 308 Gr. HS

A MC simulation of neutrino showers and their detection in Pierre Auger Observatory — •Dariusz Gora, Markus Roth, and Alessio Tamburro — Universität Karlsruhe, Forschungszentrum Karlsruhe, Institut für Experimentelle Kernphysik, Institute of Nuclear Physics PAN

High energetic neutrinos coming from the space can interact with Earth in two ways. In the first scenario neutrinos can initiate in the atmosphere extensive air showers (EAS), but due to their very small interaction cross section in air only very inclined EAS can be detectable by large neutrino detectors. In the second scenario neutrino interacts inside the Earth and produces a charge lepton which after several interaction emerges from Earth and decays above the ground.

Among the three neutrino species, the showers initiated by the tau neutrino are the most promising to be detected. The charge tau lepton has a mean free path of the order of Earth radius and a decay length about a few km at energy of about 1 EeV.

In this talk we present sensitivity studies of neutrino EAS based on detailed Monte-Carlo simulations for the Pierre Auger Observatory. Taking into account the details of neutrino propagation inside the Earth and in air as well as the profile of the mountains surrounding the Auger Observatory, the response of the Auger detector is simulated for showers with different zenith, azimuth angle and energy. Finally the aperture and acceptance at a given energy, and the observed event rate is calculated on the basis of various assumptions of the incoming neutrino flux.