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The European Physical Journal A

, Volume 15, Issue 1–2, pp 65–68 | Cite as

Coulomb breakup of 8B and the flux of 8B neutrinos from the Sun

  • B. Davids
  • S.M. Austin
  • D. Bazin
  • H. Esbensen
  • B.M. Sherrill
  • I.J. Thompson
  • J.A. Tostevin
Article

Abstract:

A kinematically complete measurement was made of the Coulomb dissociation of 8B nuclei on a Pb target at 83 MeV/nucleon. The cross-section was measured at low relative energies in order to infer the astrophysical S-factor for the 7Be(p,γ)8B reaction. A first-order perturbation theory analysis of the reaction dynamics including E1, E2, and M1 transitions was employed to extract the E1 strength relevant to neutrino-producing reactions in the solar interior. By fitting the measured cross-section from Erel = 130 keV to 400 keV, we find S17(0) = 17.8+1.4-1.2 eV b. Semiclassical 1st-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. This recommendation implies a revised value for the theoretical flux of 8B solar neutrinos, which is also given.-1

PACS. 25.70.De Coulomb excitation – 26.20.+f Hydrostatic stellar nucleosynthesis – 26.65.+t Solar neutrinos 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • B. Davids
    • 1
    • 2
  • S.M. Austin
    • 1
  • D. Bazin
    • 1
  • H. Esbensen
    • 3
  • B.M. Sherrill
    • 1
    • 2
  • I.J. Thompson
    • 4
  • J.A. Tostevin
    • 4
  1. 1.National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USAUSA
  2. 2.Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USAUSA
  3. 3.Physics Division, Argonne National Laboratory, Argonne, IL 60439, USAUSA
  4. 4.Department of Physics, School of Physics and Chemistry, University of Surrey, Guildford, UKUK

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