Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Theorie
HK 7.1: Group Report
Monday, March 10, 2008, 14:00–14:30, 2F
Status of ab-initio calculations of many-body Green functions of atoms and nuclei — •Carlo Barbieri1, Dimitri Van Neck2, and Willem H. DIckhoff3 — 1GSI, Planckstr. 1, 64291 Darmstadt, Germany — 2Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium — 3Department of Physics, Washington University, St. Louis, MO 63130, USA
We report on recent advances in calculations of atoms and nuclei, using the Faddeev expansion of the many-fermion self-energy. This method offers a microscopic approach to couplings between single particles and collective excitations of the system.
For nuclei, emphasis will be given to the accuracy achieved–sofar–in extracting binding energies, and in further extensions of the formalism.
For atoms, the Faddeev-RPA (FRPA) approach has been found to match the best (ab-initio) calculations of ionization energies and strengths (corresponding to separation energies and spectroscopic factors in nuclear physics). The use of RPA (random phase approximation) phonons opens interesting perspectives for bridging the description of small atoms or molecules to that of extended electron systems.
It will be reminded that the FRPA method has relevance for the study of transfer reactions and nuclear response, as well as close connection to dispersive optical models (DOM) and quasiparticle extensions of DFT theory (QP-DFT).