In an effort to better determine the reaction rate, we have performed inclusive and exclusive measurements of the Coulomb dissociation of The former was a study of longitudinal momentum distributions of fragments emitted in the Coulomb breakup of intermediate energy beams on Pb and Ag targets. Analysis of these data yielded the contribution to the breakup cross section. In the exclusive measurement, we determined the cross section for the Coulomb breakup of on Pb at low relative energies in order to infer the astrophysical S factor for the reaction. Interpreting the measurements with first-order perturbation theory, we obtained at and Semiclassical first-order perturbation theory and fully quantum mechanical continuum-discretized coupled channels analyses yield nearly identical results for the strength relevant to solar neutrino flux calculations, suggesting that theoretical reaction mechanism uncertainties need not limit the precision of Coulomb breakup determinations of the S factor. A recommended value of based on a weighted average of this and other measurements is presented.
- Received 14 November 2000
- Published 16 May 2001
© 2001 The American Physical Society