2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 15, 65-68 (2002)
DOI: 10.1140/epja/i2001-10227-7

Coulomb breakup of $\chem{^8B}$ and the flux of $\chem{^8B}$ neutrinos from the Sun

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

1  National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
2  Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
3  Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
4  Department of Physics, School of Physics and Chemistry, University of Surrey, Guildford, UK

davids@kvi.nl

(Received: 21 March 2002 / Published online: 31 October 2002)

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, $\gamma$) 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 $E_\ab{rel}$ = 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, $\gamma$) 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.

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

© Società Italiana di Fisica, Springer-Verlag 2002