Abstract. Nuclear structure data are of crucial importance in order to address important astrophysical problems such as the origin of chemical elements, the inner working of our Sun, and the evolution of stars. We demonstrate this by investigating the ground state structure of 8 B and 7 Be nuclei within the Skyrme Hartree-Fock framework and by calculating the overlap integral of 8 B and 7 Be wave functions. The latter is used to calculate the astrophysical S factor (S 17 ) for the solar fusion reaction 7 Be(p, γ) 8 B.