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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Theorie

HK 7.5: Vortrag

Montag, 10. März 2008, 15:15–15:30, 2F

Nuclear Structure Calculations with Modern Effective Interactions — •Heiko Hergert, Robert Roth, Panagiota Papakonstantinou, Sabine Reinhardt, and Anneke Zapp — Institut für Kernphysik, TU Darmstadt

We discuss nuclear structure calculations based on effective interactions derived from current realistic NN potentials by means of the Unitarity Correlation Operator Method and the Similarity Renormalization Group [1,2]. Both methods employ unitary transformations to treat the short-range physics of the parent NN interaction — in the UCOM, the transformation is based on a physically motivated explicit treatment of short-range central and tensor correlations, in the SRG method it is obtained by solving a flow equation in momentum space.

The resulting interactions have an improved convergence behaviour, allowing their use in a wide range of many-body methods, including the No-Core Shell Model (NCSM), Hartree-Fock(-Bogoliubov) (HF/HFB), Many-Body Perturbation Theory, RPA & quasi-particle RPA.

Quasi-exact NCSM binding energies and spectra for p-shell nuclei are in reasonable agreement with experiment already with a two-body interaction. A systematic underprediction of charge radii and level densities for larger nuclei in HF-based methods can be addressed by including 3N forces, either exactly or approximately by means of a density-dependent two-body interaction.

Work supported by the DFG (SFB 634).

[1] R. Roth et al., Phys. Rev. C73 (2006) 044312

[2] H. Hergert, R. Roth, Phys. Rev. C75 (2007) 051001(R)