Abstract
Super-Kamiokande (SK), a 50 kton water Cherenkov detector in Japan, is observing both atmospheric and solar neutrinos. It is also searching for supernova (relic) neutrinos, proton decays and dark matter-like particles. A three-flavor oscillation analysis was conducted with the atmospheric neutrino data to study the mass hierarchy, the leptonic CP violation term, and other oscillation parameters. In addition, the observation of solar neutrinos gives precise measurements of the energy spectrum and oscillation parameters. In this proceedings, we given an overview of the latest results from SK and the prospect toward the future project of SK-Gd.
Highlights
A theoretical framework of neutrino oscillation has been established in the past 50 years [1,2].Neutrino physics has been dominated by the measurement of oscillation parameters and such measurements suggest that neutrinos are massive and mixing in the lepton sector [3]
Atmospheric neutrino oscillations are mainly described as the oscillation of νμ → ντ, which depends on the mixing angle θ23 and the mass splitting ∆m232,31
Because the pattern of neutrino oscillations depends on the ratio of the travel length and the energy of neutrino (L/E), atmospheric neutrinos are an excellent tool for studies of neutrino oscillation
Summary
Solar neutrinos are produced by the nuclear fusion reaction, 4p → α + 2e+ + 2νe , in the core of the sun. Electron neutrinos (νe ) produced in the sun are so-called pp, pep, 7 Be, 8 B and hep neutrinos as well as CNO neutrinos Their fluxes are well predicted by the standard solar model [55] and are measured by several techniques, such as radiochemical (Homestake [56], SAGE and Gallex/GNO [57]), water Cherenkov (Kamiokande [58], SK and SNO [59]) and liquid scintillator (Borexino [60] and KamLAND [61]). Ni-Cf calibration source [7] is used to estimate the resolution of the reconstructed position and the detection efficiency of the low energy neutrino-like event Due to those calibrations, the systematic uncertainty on the 8 B solar neutrino flux measurement has achieved at ±1.7% in SK-IV. The total lifetime throughout the different phases of SK [72,73,74] is 5695 days
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