Frick, TobiasKaiser, SteffenMüther, HerbertPolls Martí, ArturEntem, D. R.Machleidt, R.2010-01-282010-01-2820020556-2813https://hdl.handle.net/2445/10995The influence of Delta isobar components on the ground-state properties of nuclear systems is investigated for nuclear matter as well as finite nuclei. Many-body wave functions, including isobar configurations and binding energies, are evaluated employing the framework of the coupled-cluster theory. It is demonstrated that the effect of isobar configurations depends in a rather sensitive way on the model used for the baryon-baryon interaction. As examples for realistic baryon-baryon interactions with explicit inclusion of isobar channels we use the local (V28) and nonlocal meson-exchange potentials (Bonn2000) but also a model recently developed by the Salamanca group, which is based on a quark picture. The differences obtained for the nuclear observables are related to the treatment of the interaction, the pi-exchange contributions in particular, at high momentum transfers.7 p.application/pdfeng(c) The American Physical Society, 2002Estructura nuclearExcitació nuclearNuclear structureNuclear excitationinfo:eu-repo/semantics/article196092info:eu-repo/semantics/openAccess