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Phys. Rev. Lett. 90, 022501 (2003) [4 pages]

Precision Measurement of the 7Be(p,γ)8B Cross Section with an Implanted 7Be Target

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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 7 August 2002; published 15 January 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 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 experimental conditions, yielding a value of S17(Ec.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.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.90.022501
DOI: 10.1103/PhysRevLett.90.022501
PACS: 25.40.Lw, 26.20.+f, 26.65.+t, 27.20.+n

* On leave from Horia Hulubei Institute, Bucharest, 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: Precision Measurement of the 7Be(p,γ)8B Cross Section with an Implanted 7Be Target [Phys. Rev. Lett. 90, 022501 (2003)], Phys. Rev. Lett. 92, 029901 (2004)

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