Clusters and Shell-Structure in Light Nuclei

Thomas Neff, Hans Feldmeier and Robert Roth Gesellschaft für Schwerionenforschung mbH, Planckstraße 1, 64291 Darmstadt, Germany †Institut für Kernphysik, TU Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany Abstract. Light nuclei in the p-shell are studied in the Fermionic Molecular Dynamics model. No a priori assumptions are made with respect to cluster structure or single-particle energies. The same effective interaction based on the Argonne V18 interaction is used for all nuclei. Short-range central and tensor correlations are treated explicitly using a unitary correlation operator. Calculations of binding energies and radii for Helium and Carbon isotopes are presented. The evolution of cluster and single-particle structures with increasing neutron number are discussed. The spectrum of 12C is calculated in a multiconfiguration calculation. The molecular structure of the excited states is investigated.