title: Precision measurement of the 7Be(p,gamma)8B cross section with an implanted 7Be target.
abstract: 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 E(lab)=991 keV was measured several times under varying experimental conditions, yielding a value of S17(E(c.m.)=850 keV)=24.0+/-0.5 eV b. Measurements were carried out at lower energies as well. Because of 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+/-0.7 eV b.
authors.affiliation: Department of Particle Physics, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: L T
authors.initials: LT
authors.lastname: Baby
authors.forename: C
authors.initials: C
authors.lastname: Bordeanu
authors.forename: G
authors.initials: G
authors.lastname: Goldring
authors.forename: M
authors.initials: M
authors.lastname: Hass
authors.forename: L
authors.initials: L
authors.lastname: Weissman
authors.forename: V N
authors.initials: VN
authors.lastname: Fedoseyev
authors.forename: U
authors.initials: U
authors.lastname: Köster
authors.forename: Y
authors.initials: Y
authors.lastname: Nir-El
authors.forename: G
authors.initials: G
authors.lastname: Haquin
authors.forename: H W
authors.initials: HW
authors.lastname: Gäggeler
authors.forename: R
authors.initials: R
authors.lastname: Weinreich