We have studied the ${}^8\mathrm{Li}$ and ${}^8\mathrm{B}$ nuclei within the extended $\alpha {+t(}^3\mathrm{He})+N$ model, which takes into account peculiarities of both two- and three-body dynamics. Effects of strong deformation and dynamical polarization of the ${}^7\mathrm{Li}{(}^7\mathrm{Be})$ core as well as the core excitation are treated simultaneuosly. Various observables are calculated for ${}^8\mathrm{Li}$, ${}^8\mathrm{B}$ states and compared with the experiment. Estimates, based on the values of asymptotic normalization coefficients for the obtained ${}^8\mathrm{B}$ wave function, support $S_{17}\mathrm{}\left(0\right)\mathrm{}$ value $\sim 19.2\hspace{0.5em}\mathrm{eV}\mathrm{}\mathrm{b}$.

• Received 7 October 1997

DOI:https://doi.org/10.1103/PhysRevC.57.R2099