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 Feldmeier1,2, 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 VUCOM is by construction phase-shift equivalent to the bare VNN and given in a closed operator representation. Conceptual relations and differences to the renormalization group-based approach of Vlow−k are discussed. Benchmark calculations using VUCOM in the No-Core Shell Model exhibit a significantly improved convergence due to the prediagonalization caused by the correlation operators.
VUCOM 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).