Electromagnetic dissociation of 8B and the rate of the 7Be(p,γ)8B reaction in the Sun

Phys. Rev. C 63, 065806 – Published 16 May 2001
B. Davids, Sam M. Austin, D. Bazin, H. Esbensen, B. M. Sherrill, I. J. Thompson, and J. A. Tostevin

Abstract

In an effort to better determine the 7Be(p,γ)8B reaction rate, we have performed inclusive and exclusive measurements of the Coulomb dissociation of 8B. The former was a study of longitudinal momentum distributions of 7Be fragments emitted in the Coulomb breakup of intermediate energy 8B beams on Pb and Ag targets. Analysis of these data yielded the E2 contribution to the breakup cross section. In the exclusive measurement, we determined the cross section for the Coulomb breakup of 8B on Pb at low relative energies in order to infer the astrophysical S factor for the 7Be(p,γ)8B reaction. Interpreting the measurements with first-order perturbation theory, we obtained SE2/SE1=4.7-1.3+2.0×10-4 at Erel=0.6MeV, and S17(0)=17.8-1.2+1.4eV b. Semiclassical first-order perturbation theory and fully quantum mechanical continuum-discretized coupled channels analyses yield nearly identical results for the E1 strength relevant to solar neutrino flux calculations, suggesting that theoretical reaction mechanism uncertainties need not limit the precision of Coulomb breakup determinations of the 7Be(p,γ)8B S factor. A recommended value of S17(0) based on a weighted average of this and other measurements is presented.

DOI: http://dx.doi.org/10.1103/PhysRevC.63.065806

  • Received 14 November 2000
  • Published 16 May 2001

© 2001 The American Physical Society

Authors & Affiliations

B. Davids1,2,*, Sam M. Austin1,2, D. Bazin1, H. Esbensen3, B. M. Sherrill1,2, I. J. Thompson4, and J. A. Tostevin4

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
  • 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
  • 4Department of Physics, School of Physics and Chemistry, University of Surrey, Guildford, United Kingdom

  • *Present address: Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands. Email address: davids@kvi.nl

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