Solar Neutrino Results from Super-Kamiokande
August 16, 2017
August 03, 2018
Super-Kamiokande is the world-largest water Cherenkov detector, running for neutrino obser- vations and proton decay search over 20 years. Because of its high statistics due to the large fiducial volume of 22.5 kt, lower cosmic-ray background environment in a mine at 1000m under- ground and well-calibrated detector itself, Super-K has been making the world-leading results of the Boron-8 solar neutrino measurement. We measure these solar neutrino events via neutrino- electron scattering, with the sensitivity to the neutrino event direction. Recently, our constant efforts to improve the detector enabled to lower the analysis energy threshold down to 3.5 MeV in recoil electron kinetic energy. It contributes to the search for the solar spectrum distortion and the flux measurement.
In this presentation, we will show the recent status and results of 8B solar neutrino measurement at Super-K IV over 2600 days. Then we will discuss about the measurements of solar mixing angle, the neutrino mass squared difference, day-night asymmetry of the flux and the solar spectrum distortions, referring whole SK-I to SK-IV data sets.
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