Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 40: Theorie

HK 40.2: Vortrag

Mittwoch, 9. März 2005, 14:30–14:45, TU MA005

Nuclear Structure in the UCOM Framework — •Heiko Hergert¹, Robert Roth¹, Thomas Neff², Hans Feldmeier^1,2, Nils Paar¹, and Panagiota Papakonstantinou¹ — ¹Institut für Kernphysik, TU Darmstadt — ²GSI Darmstadt

The Unitary Correlation Operator Method (UCOM) [1] provides a way to use modern NN-interactions in conjunction with simple many-body states by explicitly handling correlations induced by the strong repulsive core and the tensor force. The correlated interaction V_UCOM is by construction phase-shift equivalent to the bare V_NN and given in a closed operator representation. Conceptual relations and differences to the renormalization group-based approach of V_low−k are discussed. Benchmark calculations using V_UCOM in the No-Core Shell Model exhibit a significantly improved convergence due to the prediagonalization caused by the correlation operators.

V_UCOM is applied to variational calculations using the Gaussian trial states of Fermionic Molecular Dynamics (FMD), covering the whole nuclear chart up to A=60. Angular momentum projection is performed in order to obtain physical ground states and collective rotational spectra. Other collective excitations are accessible via configuration-mixing calculations or explicit time-evolution. Heavier nuclei are addressed in Hartree-Fock-type calculations (HF, HFB, RPA, etc.).

Work supported by the DFG (SFB 634).

[1] R. Roth, T. Neff, H. Hergert, H. Feldmeier, Nucl. Phys. A745 (2004) 3 (e-print: nucl-th/0406021).