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A significant decay branch of 8B to the ground state of 8Be would extend thesolar neutrino spectrum to higher energies than anticipated in the standardsolar models. These high-energy neutrinos would affect current neutrinooscillation results and also would be a background to measurements of the hepprocess. We have measured the delayed alpha particles from the decay of 8B,with the goal of observing the two 46-keV alpha particles arising from theground-state decay. The 8B was produced using an in-flight radioactive beamtechnique. It was implanted in a silicon PIN-diode detector that was capable ofidentifying the alpha-particles from the 8Be ground state. From thismeasurement we find an upper limit (at 90% confidence level) of 7.3 x 10^{-5}for the branching ratio to the ground state. In addition to describing thismeasurement, we present a theoretical calculation for this branching ratio.

Search for the second forbidden beta decay of 8B to the ground state of 8Be