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Atmospheric Neutrino Oscillations in SK-I

The Super-Kamiokande experiment has completed an analysis of all the “SK-I” atmospheric neutrino data, spanning the period since it came on-line in April of 1996 to shutdown for maintenance in July of 2001. Improvements to both data reduction and Monte Carlo predictions have been uniformly applied to this complete set of data. The results emphatically support νμ ↔ ντ oscillations, disfavor alternative νμ disappearance mechanisms such as oscillation to sterile neutrinos or neutrino decay, and place limits on νμ ↔ νe oscillations.