Latest Results from Super-Kamiokande

Hirokazu Ishino
2014 Proceedings of the 12th Asia Pacific Physics Conference (APPC12)   unpublished
We present the latest results from Super-Kamiokande (SK) for solar, atmospheric and supernova neutrinos. SK is the world's largest water Cherenkov detector that consists of 50,000 tons of water and about 12,000 photo-multiplier tubes. This enables us to accumulate the highest statistics of neutrino events from the sun and atmosphere on the Earth, and to search for the relic supernova neutrinos with the highest sensitivity. Solar neutrinos interact with electrons in water via the elastic
more » ... the elastic scatterings which hold the directionality. We, therefore, are able to identify the solar neutrino events by comparing the directions of the reconstructed events and the sun. The measurement results of the solar neutrino flux, the energy spectrum and the flux difference between day and night are presented. We also report the neutrino oscillation analysis results based on the measurements. Atmospheric neutrinos are created in the atmosphere by the hadronic interactions of the cosmic rays. The decays of hadrons and muons produce both electron and muon neutrinos. SK has a capability to distinguish between the muon and electron events from their Cherenkov ring images, and can identify the neutrino flavors. The zenith-angle, the energy and the flavor of the events are used to determine the neutrino oscillation parameters. The relic supernova neutrinos are neutrinos produced by the past supernovae in the universe. The detection of the neutrinos may give us a hint of the supernova explosion mechanism and the history of the production of heavy elements. We present the latest results of a search for the relic supernova neutrinos. We also present the status of the real-time supernova neutrino monitor in SK. APPC12 The 12th Asia Pacific Physics Conference -171 -B1-3-O4
doi:10.7566/jpscp.1.013008 fatcat:3im2rgqkgbc6xozps62ckqcy5q