Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 27: Nuclear Structure and Dynamics II

HK 27.1: Vortrag

Dienstag, 17. März 2009, 14:00–14:15, H-ZO 50

Beyond the relativistic mean-field approximation: configuration mixing calculations — •Tamara Niksic¹, Dario Vretenar¹, and Peter Ring² — ¹Physics Department, University of Zagreb, Croatia — ²Physics Department, Technical University Munich, Germany

The framework of relativistic self-consistent mean-field models is extended to include correlations related to the restoration of broken symmetries and to fluctuations of collective variables. The generator coordinate method is used to perform configuration mixing of angular-momentum and particle-number projected relativistic wave functions. Intrinsic wave functions are generated from the solutions of relativistic mean-field equations, with a constraint on the mass quadrupole moment. The model, currently restricted to axially symmetric shapes, employs a relativistic point-coupling (contact) nucleon-nucleon effective interaction in the particle-hole channel, and a density-independent δ-interaction in the pairing channel. Both global and spectroscopic properties of nuclei are discussed.

In addition, an implementation of the five-dimensional collective Hamiltonian for quadrupole vibrational and rotational degrees of freedom is developed. The parameters are determined by constrained self-consistent mean-field calculation for triaxial shapes. The model is applied to nuclei in the Z=60,62 and 64 with N∼90 region of the periodic chart.