New measurement of the proton capture rate on 7Be and the S 17(0) factor

L. T. Baby, C. Bordeanu, G. Goldring, M. Hass, L. Weissman, V. N. Fedoseyev, U. Köster, Y. Nir-El, G. Haquin, H. W. Gäggeler, R. Weinreich

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


The 7Be(p, γ)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 backscattering losses. The new measurement incorporates a higher activity 7Be target and a number of improvements in design and procedure. The cross section at a selected energy Ec.m. = 850 keV (where c.m. stands for center of mass) was measured several times under varying experimental conditions, yielding a value of S17(E c.m. = 850 keV) = 24.0±0.5 eV b, to serve as a benchmark. 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 S 17(0) = 21.2±0.7 eV b, using the cluster model of Descouvemont and Baye.

Original languageEnglish
Article number065805
Pages (from-to)658051-6580514
Number of pages14
JournalPhysical Review C - Nuclear Physics
Issue number6
StatePublished - 1 Jan 2003
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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