Recent results from Super-Kamiokande

Recent results from Super-Kamiokande on atmospheric neutrinos, solar neutrinos and supernova neutrinos are presented. The atmospheric neutrino data shows an evidence for νμ oscillations in the ratio of νμ/νe and zenith angle distributions of μ-like events. The neutrino oscillation parameters obtained from the atmospheric neutrino data are Δm2=(1.7−4)×10−3 eV2 and sin2 2θ>0.89 for νμ↔ντ oscillations. The zenith angle distributions of higher energy atmospheric neutrino data show that the pure νμ↔ντ oscillations are favored over the pure νμ↔νsterile oscillations. The analyses of solar neutrino data on day/night difference in flux and spectral shape of 8B solar neutrinos constrained the oscillation parameters for νe oscillations. The small mixing angle solution and just-so solutions are disfavored with about 95% C.L. The flux constrained analysis of day/night and energy spectrum favours large mixing solutions. The huge Super-Kamiokande detector is able to detect ∼4000 neutrino events, if a supernova happens at the center of our galaxy. No neutrino burst has been observed at SK yet. Progress of the search for relic supernova neutrinos is also discussed.