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The Be(p,g)B reaction plays a central role in the evaluation of solar neutrino fluxes. We report on a new precision measurement of the cross section of this reaction, following our previous experiment with an implantedBe target, a raster-scanned beam, and the elimination of backscattering losses. The new measurement incorporates a higher activityBe target and a number of improvements in design and procedure. The cross section at a selected energy Ec.m.5850 keV~where c.m. stands for center of mass ! was measured several times under varying experimental conditions, yielding a value of S17(Ec.m.5850 keV)524.0 60.5 eV b, to serve as a benchmark. Measurements were carried out at lower energies as well. Due to the precise knowledge of the implantedBe density profile, it was possible to reconstitute both the offand on-resonance parts of the cross section and to obtain from the entire set of measurements an extrapolated value of S17(0)521.260.7 eV b, using the cluster model of Descouvemont and Baye.

A New Measurement of the Proton Capture Rate on 7Be and the S17(0) Factor