Reanalysis of the 7Be(p,γ)8B S factor in a microscopic model -: art. no. 065802

A previous microscopic three-cluster calculation, applied to the Be-7(p,gamma)B-8 reaction, is updated in several ways: the Be-7 description is improved, two nucleon-nucleon interactions are considered, and new experimental information about the scattering lengths is taken into account. Weak changes in the energy dependence of the S factor are obtained. A "theoretical" uncertainty is estimated. It amounts to 5% near 1 MeV but reaches more than 10% when energy increases. We suggest that reducing the current uncertainty on the experimental scattering length would significantly reduce the error bar on S-17(0). Elastic Be-7+p phase shifts are briefly discussed and analyzed for different Be-7 deformations. We show that the differences with the potential model are due to shortcomings of that model, such as the lack of Be-7 deformation, included in the present approach. We also investigate the Li-8 and B-8 spectroscopy, electromagnetic transition probabilities, and spectroscopic factors. The He-5+H-3 configuration (or mirror) is shown to be important in the ground-state structure.