Structure of light nuclei in Fermionic Molecular Dynamics

Helium and Beryllium isotopes are studied in the Fermionic Molecular Dynamics model. No a priori assumptions are made with respect to cluster structure or single-particle energies. An 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. Mul- ticonfiguration calculations using the dipole and quadrupole moments as generator coordinates are able to describe the experimental binding energies and matter radii. The evolution of the cluster structure and the single-particle structure with increasing neutron number is discussed.