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This paper aims to study the feasibility of building an Earth-skimming cosmictau neutrinos detector, with the aim of eventually identifying the idealdimensions of a natural site (mountainvalley) for the detection, with theenergy range to be determined (evidently, the highest possible numbers rangefrom 1015 eV to 1020 eV), and possibly locate one such site in Algeria. First,a Monte Carlo simulation of the neutrino-[mountain]matter interaction as wellas the resulting decay of the tau lepton is conducted to determine the optimaldimensions of the mountain as well as the location of the tau decay in thevalley. Second, a CORSIKA (COsmic Ray Simulation for KAscade) [1] simulationwith the CONEX option is conducted to track the evolution of the almosthorizontal air shower born from the tau lepton. Among the particles produced inthe shower are: electrons, muons, gammas, pions, etc). The study of the spatialdistribution of these particles enables the discovery of the optimal width ofthe valley, and consequently, the distance at which to lay the detectionnetwork.

Earth-skimming Ultra-high Energy Tau Neutrinos simulated with MonteCarlo method and CONEX code