Shape of the 8B Alpha and Neutrino Spectra

Details Shape of the 8B Alpha and Neutrino Spectra Shape of the 8B Alpha and Neutrino Spectra

2000-03-13

arxiv.org/abs/nucl-ex/0003006v2

Phys.Rev.Lett. 85 (2000) 2909-2912

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.85.2909

The beta-delayed alpha spectrum from the decay of 8B has been measured with a setup that minimized systematic uncertainties that affected previous measurements. Consequently the deduced neutrino spectrum presents much smaller uncertainties than the previous recommendation. The 8B neutrino spectrum is found to be harder than previously recommended with about (10-20)% more neutrinos at energies between 12-14 MeV. The efficiencies of the 37Cl, 71Ga, 40Ar, and SuperKamiokande detectors are respectively, 3.6%, 1.4%, 5.7% and 1.8% larger than previously thought.

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