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Phys. Rev. C 67, 065805 (2003) [14 pages]

New measurement of the proton capture rate on 7Be and the S17(0) factor

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L. T. Baby1, C. Bordeanu1 *, G. Goldring1, M. Hass1, L. Weissman2, V. N. Fedoseyev3, U. Köster3, Y. Nir-El4, G. Haquin4, H. W. Gäggeler5, and R. Weinreich5 (ISOLDE Collaboration)
1Department of Particle Physics, Weizmann Institute of Science, Rehovot, Israel
2NSCL, Michigan State University, East Lansing, Michigan 48824
3ISOLDE, CERN, Geneva, Switzerland
4Soreq Research Centre, Yavne, Israel
5Paul Scherrer Institute, Villigen, Switzerland

 See Also: Erratum

Received 11 December 2002; published 23 June 2003

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(Ec.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 S17(0)=21.2±0.7 eV b, using the cluster model of Descouvemont and Baye.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.67.065805
DOI: 10.1103/PhysRevC.67.065805
PACS: 25.40.Lw, 26.65.+t, 26.20.+f, 27.20.+n

* On leave from Horia Hulubei-National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania.

See Also

Erratum: L. T. Baby, C. Bordeanu, G. Goldring, M. Hass, L. Weissman, V. N. Fedoseyev, U. Köster, Y. Nir-El, G. Haquin, H. W. Gäggeler, and R. Weinreich the ISOLDE Collaboration, Erratum: New measurement of the proton capture rate on 7Be and the S17(0) factor [Phys. Rev. C 67, 065805 (2003)], Phys. Rev. C 69, 019902 (2004)

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