Precise 8B solar neutrino spectrum for neutrino oscillation analysis

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Solar neutrino spectrum from 8B is one of the most precise observables to investigate the neutrino oscillation beyond the standard model. One of the largest uncertainties of neutrino spectrum observed at Super-Kamiokande is the spectral shape factor just after the neutrino emission from 8B. In this study, the weak magnetism and axial charge matrix elements, which are the terms in shape factor, were determined directly from experimental results of beta decay. Uncertainties in the shape factor were determined based on experimental uncertainties for the first time.