Abstract
Results from Super-Kamiokande-I’s entire 1496 live days of solar neutrino data are presented, including the absolute flux, energy spectrum, zenith angle (day/night) and seasonal variation. The possibility of MSW and vacuum oscillations is discussed in light of these results. Results from the first 1289 days of Super-K-I’s atmospheric neutrino analysis are also presented, including the evidence for νμ →ν τ oscillations, against νμ → νsterile oscillations, and the current limits on proton decay. Finally, results based on 56 × 1019 protons on target are given for the K2K long-baseline neutrino oscillation experiment.
Highlights
Super-Kamiokande is the product of the collaborative effort of approximately 110 Japanese and American astrophysicists, many of whom previously worked on either the Kamiokande or IMB water Cherenkov experiments
Located under 1 km of rock (2700 m water equivalent) in the same ancient zinc mine as the old Kamiokande detector and the new KamLAND experiment, Super-K shares the same basic design as its former neighbor and namesake: a cylinder of ultra-pure water surrounded with inwardfacing photomultiplier tubes (PMT’s), a light barrier, a layer of outward-facing PMT’s, and a veto region of water, all contained within a stainless steel tank
An order of magnitude larger than its predecessors, Super-K has been designed to be a premier facility for studying solar neutrinos, atmospheric neutrinos, nucleon decay, and neutrinos from galactic supernovae
Summary
Super-Kamiokande is the product of the collaborative effort of approximately 110 Japanese and American astrophysicists, many of whom previously worked on either the Kamiokande or IMB water Cherenkov experiments. Beginning in late spring of 1999, a new experiment, KEK to Kamioka (K2K), started taking data As seen, this project directs a beam of artificially produced muon neutrinos through Japan from the KEK accelerator laboratory outside Tokyo all the way through central Japan to Super-K, some 250 km distant. A one kton water Cherenkov detector, essentially a 2% scale model of Super-K located 300 m from the end of the neutrino. Super-Kamiokande is expected to be back on line with its full complement of outer tubes and about 50% of its difficult-to-manufacture inner tubes (rearranged to provide even coverage) by the end of 2002. Before the new JHF machine turns on and sends an intense long-baseline neutrino beam to Mozumi in 2007, Super-K will be restored to its full inner PMT coverage
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