Structure of 8B and astrophysical S17 factor in Skyrme Hartree-Fock theory
Abstract
We investigate the ground state structure of 8B within the Skyrme Hartree-Fock framework where spin-orbit part of the effective interaction is adjusted to reproduce the one-proton separation energy of this nucleus. Using same set of force parameters, binding energies and root mean square radii of other light p-shell unstable nuclei, 8Li, 7B,7Be, and 9C, have been calculated where a good agreement with corresponding experimental data is obtained. The overlap integral of 8B and 7Be wave functions has been used to determine the root mean square radius of the single proton in a particular orbit and also the astrophysical S factor (S17) for the 7Be(p, γ)8B radiative capture reaction. It is found that the asymptotic region (distances beyond 4 fm) of the p-shell single proton wave function contributes more than half to the calculated value (4.93 fm) of the corresponding single particle root mean square radius. We determine a S17 21.1 eV.b which is in good agreement with the recommended value for near zero energy S17 of 19.0+4.0-1.0 eV.b.
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