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Delta(1232) isobar excitations and the ground state of nuclei
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The 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.
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FRICK, Tobias, et al. Delta(1232) isobar excitations and the ground state of nuclei. Physical Review C. 2002. Vol. 65, num. 3, pags. 034316-1-034316-7. ISSN 0556-2813. [consulted: 20 of August of 2026]. Available at: https://hdl.handle.net/2445/10995