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Introduction

Atmospheric neutrinos are produced in the cascade originated in the atmosphere by a primary cosmic ray. This field has a special interest because the water Cerenkov experiments, IMB in the United States and Kamiokande in Japan, discovered that the ratio between events with a muon and those with an electron was lower than expected. A possible interpretation of this anomaly is the oscillation of the neutrino species in the path length between the production point and the detector (in the range 10 -13000 km). The anomaly was not confirmed by the proton decay iron fine-grained experiments NUSEX and Frejus.

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