Measurements of Atmospheric Neutrinos in the Super{kamiokande Detector
نویسنده
چکیده
We have measured atmospheric neutrinos using data from a 25.5 kton year of the Super{Kamiokande detector. Using detailed ux calculations and detector simulations, we con rm that the avor ratio = e is signi cantly smaller than the expected value. Measured zenith angle distributions indicate that the small avor ratio is due to a de cit of upward going muon neutrinos. The neutrino oscillation hypothesis is strongly supported by the observed zenith angle distributions as well as the anomalous avor ratio. E-mail: [email protected]
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