München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 18: Theorie

HK 18.4: Vortrag

Dienstag, 21. März 2006, 14:45–15:00, B

Nuclear Structure in the UCOM Framework: Few-Body Systems — •Heiko Hergert¹, Robert Roth¹, Panagiota Papakonstantinou¹, Nils Paar¹, Thomas Neff², and Hans Feldmeier³ — ¹Institut für Kernphysik, TU Darmstadt — ²NSCL, Michigan State University — ³GSI Darmstadt

Recently, we have established the Unitary Correlation Operator Method (UCOM) [1,2] as a tool for using realistic NN-interactions in traditional methods of nuclear structure theory by explicitly treating correlations induced by the strong repulsive core and the tensor force. The resulting correlated interaction V_UCOM maintains phase-shift equivalence with the bare V_NN.

The main focus of this talk are No-Core Shell Model (NCSM) calculations with V_UCOM, which exhibit a significantly improved convergence. In addition, we obtain information on the interplay of short- and long-range correlations, which can be used to constrain V_UCOM further. In this context, we also discuss the inclusion of 3N-forces. We present NCSM results for various p-shell nuclei (binding energies, spectra, etc.), which are in very good agreement with experiment.

In Fermionic Molecular Dynamics (FMD), V_UCOM is used in variational calculations up to A=60. Projection techniques and configuration-mixing calculations provide access to excitations and recover important features like the 3α-structure of the Hoyle-state in ¹²C.

Work supported by the DFG (SFB 634).

[1] R. Roth et al., Nucl. Phys. A745 (2004) 3

[2] R. Roth et al., Phys. Rev. C72 (2005) 034002