Dressed bosons theory for nuclear structure

The structure of nuclei of even number of nucleons is investigated in the boson-dynamic correlation model where valence-particle-excitation as well as core-excitation modes coexist. The model is nonperturbative and does not employ effective operators. The eigenstates of the model are the self-consistent solution of a set of nonlinear dynamical equations, which represents valence-particle pairs dressed by their interactions with the nuclear medium. The model is applied to medium mass as well as light nuclei. Our study of 18O reveals that the inclusion and the nonperturbative treatment of core excitations are the principal reasons for obtaining a correct ordering of the energy levels, a more complete spectrum and a much better agreement with the experimental low-lying as well as high-lying states than other published calculations. Our study of light nuclei 6He and 6Li shows that the halo formation in these nuclei is also a consequence of the excitation of the core protons and that halo can also be associated with valence proton-neutron pairs. The calculated matter distributions of these two nuclei reproduce well the differential cross sections obtained in proton elastic scattering experiments. The cluster-factorization method that expedites nonperturbative calculations is elucidated