  The discrepancy of the measured solar neutrino flux compared to the
predictions of the standard solar model may be explained by the neutrino flavor
oscillation hypothesis. A more direct and less model-dependent test of this
hypothesis is a measurement of the distortion of the shape of the solar
neutrino energy spectrum. Super-Kamiokande studies the energy spectrum of
recoil electrons from solar neutrino scattering in water above 5.5 MeV.
