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.
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Davids, B. et al. (2003). Coulomb breakup of 8B and the flux of 8B neutrinos from the Sun. In: Äystö, J., Dendooven, P., Jokinen, A., Leino, M. (eds) Exotic Nuclei and Atomic Masses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55560-2_33
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DOI: https://doi.org/10.1007/978-3-642-55560-2_33
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