The atmospheric neutrino beam  Atmospheric neutrinos  Atmospheric neutrinos

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.