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Advances in High Energy Physics
Volume 2012 (2012), Article ID 504715, 24 pages
Review Article

Atmospheric Neutrinos

Institute for Cosmic Ray Research and Kavli-IPMU, The University of Tokyo, Kashiwa-no-ha 5-1-5, Kashiwa, Chiba 277-8582, Japan

Received 8 July 2012; Accepted 11 September 2012

Academic Editor: Koichiro Nishikawa

Copyright © 2012 Takaaki Kajita. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Atmospheric neutrinos are produced as decay products in hadronic showers resulting from collisions of cosmic rays with nuclei in the atmosphere. Electron-neutrinos and muon-neutrinos are produced mainly by the decay chain of charged pions to muons to electrons. Atmospheric neutrino experiments observed zenith angle and energy-dependent deficit of muon-neutrino events. It was found that neutrino oscillations between muon-neutrinos and tau-neutrinos explain these data well. This paper discusses atmospheric neutrino experiments and the neutrino oscillation studies with these neutrinos.