Abstract

Super-Kamiokande (SK), a 50 kton water Cherenkov detector in Japan, is observing neutrinos and searching for proton decay and neutrino produced by dark matter. In solar neutrino analysis, SK studies the effects of both the solar and terrestrial matter density on neutrino oscillations: a distortion of the solar neutrino energy spectrum would be caused by the edge of the Mikheyev-Smirnov-Wolfenstein resonance in the solar core, and terrestrial matter effects would induce a day/night solar neutrino flux asymmetry. The installation of new front-end electronics in 2008 marks the beginning of the 4th phase of SK (SK-IV). On 2018 May, we finished taking data of SK-IV and started the refurbishment work in order to clean the inside of the detector and to seal the water tank to prevent water tank toward SK-Gd. In this proceedings, we overview the latest solar neutrino results in SK-IV, for example, the precise measurement of 8B solar neutrino flux, its energy spectrum and oscillation parameters. In addition, we discuss the future prospect of the new phase of SK-V.

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