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

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

2007-10-28

arxiv.org/abs/0710.5197v2

Phys.Rev.C76:055806,2007

Physics

Nuclear Physics

Nuclear Experiment

One reference corrected. Minor edits in text

Scientific paper

10.1103/PhysRevC.76.055806

A significant decay branch of 8B to the ground state of 8Be would extend the solar neutrino spectrum to higher energies than anticipated in the standard solar models. These high-energy neutrinos would affect current neutrino oscillation results and also would be a background to measurements of the hep process. 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 the ground-state decay. The 8B was produced using an in-flight radioactive beam technique. It was implanted in a silicon PIN-diode detector that was capable of identifying the alpha-particles from the 8Be ground state. From this measurement 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 this measurement, we present a theoretical calculation for this branching ratio.

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