München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.45: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
"Mean-field and beyond - a case study with Skyrme forces" — •P. Klüpfel1, K. Besold1, P.-G. Reinhard1, T. Bürvenich2, and J.A. Maruhn3 — 1Inst. f. Theor. Physik, Univ. Erlangen, Erlangen/Germany — 2Frankfurt Inst. f. Advanced Studies, Frankfurt/Germany — 3Inst. f. Theor. Physik, Univ. Frankfurt, Frankfurt/Germany
Self-consistent mean-field models provide an excellent description of nuclear bulk properties over the whole table of isotopes, except perhaps for the lightest ones. Increasing demands on accuracy and the aim to access more detailed observables lead into a domain where correlation effects can become important. This concerns in particular the correlations from low-energy and symmetry modes which show the largest fluctuations over the the nuclei. They are computed within the Skyrme mean-field method by an approximate generator-coordinate method.
We demonstrate the correlations effects with a few examples as, e.g., the computation of energy differences (separation energies) or isotopic shifts. The importance of correlation is then checked systematically for all semi-magic nuclei. This allows to identify the best "mean field" nuclei, i.e. those for which correlations are negligible. The selection thus obtained provides a new, and more reliable, data set for the fine-tuning of the mean-field parametrizations (Skyrme force, relativistic mean field). We will present first results from systematic investigations along these lines.