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HK: Fachverband Hadronen und Kerne

HK 27: Nuclear Structure and Dynamics II

HK 27.5: Talk

Tuesday, March 17, 2009, 15:00–15:15, H-ZO 50

Nuclear response using realistic interactions and extended RPA theories — •Panagiota Papakonstantinou, Anneke Günther, Heiko Hergert, Sabine Reinhardt, and Robert Roth — Institut für Kernphysik, T.U. Darmstadt, Germany

Realistic interactions, renormalized within the Unitary Correlation Operator Method, were employed recently in Second RPA (SRPA) calculations of nuclear response. Results will be presented and the main lessons learned will be discussed. In particular, our results, which represent a great improvement over our earlier RPA calculations, as well as physical arguments, suggest the prospect of describing nuclear collective excitations realistically and consistently using extended RPA (ERPA) theories, like SRPA, and renormalized interactions with good convergence properties.

Up to now, only two-body Hamiltonians have been considered and most of the results have been obtained using a softened Argonne V18 potential. Appropriate three-body terms can be included to improve the Hamiltonian. Prospects with chiral interactions will also be discussed. Further issues to be addressed are related to the ERPA method itself: The standard SRPA based on the quasi-boson approximation may not be the best RPA extension, as it suffers from intrinsic inconsistencies and instabilities.