München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 18: Theorie

HK 18.3: Vortrag

Dienstag, 21. März 2006, 14:30–14:45, B

Nuclear structure within the UCOM framework: Many-body calculations — •Panagiota Papakonstantinou, Robert Roth, Nils Paar, and Heiko Hergert — Institut für Kernphysik, T.U. Darmstadt

Correlated Hamiltonians derived from realistic nucleon-nucleon interactions within the Unitary Correlation Operator Method (UCOM) are employed in many-body calculations across the nuclear chart. Ground state properties of nuclei are examined within Hartree-Fock (HF) and HF-Bogolyubov method and within many-body Perturbation Theory (PT) and Configuration-Interaction method. The results show that residual ground-state long-range correlations not treated by the UCOM are perturbative. Binding energies are reproduced across the nuclear chart within PT. In order to improve the description of other ground-state observables, the possibility to employ a phenomenological three-body force is explored. Properties of collective states are calculated within standard and extended versions of the RPA. Our results reflect the properties of the UCOM Hamiltonian as an effective interaction and demonstrate the importance of LRC and second-order effects as well as the missing three-body force.