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 E rel = 130 keV to 400 keV, we find S 17(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 S 17(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
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Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
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ID="a"Present address: Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands; e-mail: davids@kvi.nl
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Davids, B., Austin, S., Bazin, D. et al. Coulomb breakup of 8B and the flux of 8B neutrinos from the Sun. Eur Phys J A 15, 65–68 (2002). https://doi.org/10.1140/epja/i2001-10227-7
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DOI: https://doi.org/10.1140/epja/i2001-10227-7