Giant Resonances using Correlated Realistic Interactions: The Case for Second RPA
| dc.creator | Papakonstantinou, P. | |
| dc.creator | Roth, R. | |
| dc.date | 2007-09-20 | |
| dc.date.accessioned | 2026-07-07T08:31:02Z | |
| dc.date.available | 2026-07-07T08:31:02Z | |
| dc.description | Lately we have been tackling the problem of describing nuclear collective excitations starting from correlated realistic nucleon-nucleon (NN) interactions. The latter are constructed within the Unitary Correlation Operator Method (UCOM), starting from realistic NN potentials. It has been concluded that first-order RPA with a two-body UCOM interaction is not capable, in general, of reproducing quantitatively the properties of giant resonances (GRs), due to missing higher-order configurations and long-range correlations as well as neglected three-body terms in the Hamiltonian. Here we report results on GRs obtained by employing a UCOM interaction based on the Argonne V18 potential in Second RPA (SRPA) calculations. The same interaction is used to describe the Hartree-Fock (HF) ground state and the residual interactions. We find that the inclusion of second-order configurations -- which effectively dress the underlying HF single-particle states with self-energy insertions -- produces sizable corrections. The effect appears essential for a realistic description of GRs when using the UCOM. We argue that effects of higher than second order should be negligible. Therefore, the UCOM-SRPA emerges as a promising tool for consistent calculations of collective states in closed-shell nuclei. This is an interesting development, given that SRPA can accommodate more physics than RPA (e.g., fragmentation). Remaining discrepancies due to the missing three-body terms and self-consistency issues of the present SRPA model are pointed out. | |
| dc.description | 6 pages, incl. 1 figure; Proc. 26th Int. Workshop on Nuclear Theory, June 2007, Rila mountains, Bulgaria | |
| dc.identifier | https://arxiv.org/abs/0709.3167 | |
| dc.identifier | http://arxiv.org/abs/0709.3167 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/138397 | |
| dc.subject | Nuclear Theory | |
| dc.title | Giant Resonances using Correlated Realistic Interactions: The Case for Second RPA | |
| dc.type | text |