Interactions and Response Functions in Exotic Nuclei

The transition from mean-field to correlation dynamics is studied by nuclear many-body theory in nuclear matter and finite nuclei at extreme isospin. In-medium interactions in nuclear and hypernuclear matter are described by DDRH theory with density dependent meson-baryon vertex functionals. Dynamical correlations from pairing interactions and core polarization are found to increase strongly when approaching the driplines. This is accompanied by a strong reduction of mean-field configurations, as indeed observed in recent experiments. The low-lying dipole strength in medium and heavy mass nuclei is investigated with anharmonicities from up to three phonon admixtures.