A New Precision Measurement of the 7Be(p,gamma)8B Cross section with an   Implanted 7Be Target
  The 7Be(p,gamma)8B 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 implanted 7Be target, a raster scanned beam and the elimination of the backscattering loss. The new measurement incorporates a more abundant 7Be target and a number of improvements in design and procedure. The point at Elab=991 keV was measured several times under varying conditions, yielding a value of S17(Ec.m. =850 keV) = 24.0(5) eV b. Measurements were carried out at lower energies as well. Due to the precise knowledge of the implanted 7Be density profile it was possible to reconstitute both the off- and on resonance parts of the cross section and to obtain from the entire set of measurements an extrapolated value of S17(0)=21.2(7) eV b. 
L.T. Baby, C. Bordeanu, G. Goldring, M. Hass, L. Weissman, V.N.   Fedoseyev, U. Koester, Y. Nir-El, G. Haquin, H.W. Gaggeler...