"Super-Kamiokande": First Results.

Mathematics – Logic

Scientific paper

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Scientific paper

Flavour oscillation of neutrinos is not only a logical possibility but interpretation of present data suggests likely ranges of the parameters for the oscillation. These parameters include the mass splittings (Δ m^2), the mixing angles (sin^2(θ)) and lower limits of the masses of the neutrinos. Definitive findings would have strong implications in the theory of particles and in astrophysics. The "Super-Kamiokande" experiment with a 50,000ton water Cerenkov detector, became operational in April 1996. Significant data are already collected on tests of the hypothesis of neutrino oscillation. To have definitive measurements of neutrino oscillation, we must measure the flavour identified flux of neutrinos as a function of proper time, and preferably over a large fraction of a period. To accomplish this in Superkamiokande, we are measuring the neutrino fluxes as a function of distance/energy of flavour identified neutrinos as well as the effect of possible mass enhanced neutrino flavour oscillation. The neutrino sources are the sun and the neutrinos produced in the earth's atmosphere by cosmic rays. We will show preliminary measurements of Superkamiokande and their interpretations. Extrapolations of the present results to the higher statistical accuracy expected in 1998 are expected to produce definitive tests of some flavour oscillation hypothesese. Other results will include higher sensitivity searchs for nucleon decay and super novae searches. http://www.phys.washington.edu/ young/

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