Super-Kamiokande is a 50,000 ton ring-imaging water
Cerenkov detector located at a depth of 2700 meters water equivalent in
the Kamioka Mozumi mine in Japan. Super-K was designed to search for proton
decay, and to studyatmosphericand
solar neutrinos. Super-K has found evidence of the transformation of muon
type neutrinos to tau type neutrinos. This is strong evidence that neutrinos
have a small, but finite mass.