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HK: Physik der Hadronen und Kerne

HK 34: Theorie

HK 34.6: Vortrag

Dienstag, 8. März 2005, 17:45–18:00, TU MA042

Nuclear density functional constrained by low-energy QCD — •Paolo Finelli¹, Norbert Kaiser¹, Dario Vretenar², and Wolfram Weise¹ — ¹Physik Department, Technische Universität München, D-85747 Garching, Germany — ²Physics Department, University of Zagreb, 10000 Zagreb, Croatia

We have developed a relativistic point-coupling model of nuclear many-body dynamics constrained by the low-energy sector of QCD. The effective Lagrangian is characterized by density-dependent coupling strengths determined by chiral one- and two-pion exchange (with single and double delta isobar excitation) and by large isoscalar background fields that arise through changes of the quark condensate and the quark density at finite baryon density. The model has been tested in the analysis of nuclear ground-state properties (binding energies, root mean square radii, single particle structure) along different isotope chains of medium and heavy nuclei. The agreement with experimental data is comparable with the best purely phenomenological descriptions. The built-in QCD constraints and the explicit treatment of pion exchange restrict the freedom in adjusting parameters and functional forms of density-dependent couplings. It is shown that chiral pionic fluctuations play a prominente role for nuclear binding and saturation machanism, whereas background fields of about equal magnitude and opposite sign generate effective spin-orbit potential in nuclei.

Work supported in part by BMBF and GSI.