Köln 2004 – wissenschaftliches Programm

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PV: Plenarvorträge

PV IX

PV IX: Plenarvortrag

Dienstag, 9. März 2004, 11:00–11:30, P

Towards Ab-Initio Nuclear Structure Calculations using Correlated Realistic NN-Potentials — •Robert Roth¹, Nils Paar¹, Heiko Hergert¹, Thomas Neff², and Hans Feldmeier² — ¹Institut für Kernphysik, Technische Universität Darmstadt — ²Gesellschaft für Schwerionenforschung, Darmstadt

The implementation of realistic nucleon-nucleon interactions, such as the Bonn or Argonne potentials, poses a challenge to modern nuclear structure calculations. Two basic features of these interactions, the short-range repulsive core and the strong tensor force, generate pronounced correlations within the many-body state, which cannot be described within the simple model spaces available in traditional many-body techniques for larger nuclei.

We discuss a new scheme, the Unitary Correlation Operator Method, which includes these particular correlations into a given model space by means of a unitary transformation. This enables us to deduce a phase-shift equivalent correlated interaction which is well suited for Hartree-Fock or Shell-Model-type calculations. We present results for ground states and low-lying excitations across the whole nuclear chart up to mass numbers A≈ 60 obtained within a simple variational calculation using Slater determinants of Gaussian single-nucleon trial states. Aspects of angular momentum projection of the intrinsically deformed states and configuration mixing are discussed as well as the possible inclusion of three-body forces.