Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach
We present fully self-consistent calculations of isoscalar giant monopole and quadrupole as well as isovector giant dipole resonances in heavy and light nuclei. The description is based on Skyrme energy-density functionals determining the static Hartree–Fock ground state and the excitation spectra w...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2015-10-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315006048 |
| _version_ | 1818249960722792448 |
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| author | N. Lyutorovich V. Tselyaev J. Speth S. Krewald F. Grümmer P.-G. Reinhard |
| author_facet | N. Lyutorovich V. Tselyaev J. Speth S. Krewald F. Grümmer P.-G. Reinhard |
| author_sort | N. Lyutorovich |
| collection | DOAJ |
| description | We present fully self-consistent calculations of isoscalar giant monopole and quadrupole as well as isovector giant dipole resonances in heavy and light nuclei. The description is based on Skyrme energy-density functionals determining the static Hartree–Fock ground state and the excitation spectra within random-phase approximation (RPA) and RPA extended by including the quasiparticle-phonon coupling at the level of the time-blocking approximation (TBA). All matrix elements were derived consistently from the given energy-density functional and calculated without any approximation. As a new feature in these calculations, the single-particle continuum was included thus avoiding the artificial discretization usually implied in RPA and TBA. The step to include phonon coupling in TBA leads to small, but systematic, down shifts of the centroid energies of the giant resonances. These shifts are similar in size for all Skyrme parametrizations investigated here. After all, we demonstrate that one can find Skyrme parametrizations which deliver a good simultaneous reproduction of all three giant resonances within TBA. |
| first_indexed | 2024-12-12T15:44:48Z |
| format | Article |
| id | doaj.art-2ea991cd6bae4e04b3bd5c56effa3694 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-12T15:44:48Z |
| publishDate | 2015-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-2ea991cd6bae4e04b3bd5c56effa36942022-12-22T00:19:48ZengElsevierPhysics Letters B0370-26931873-24452015-10-01749C29229710.1016/j.physletb.2015.08.003Isoscalar and isovector giant resonances in a self-consistent phonon coupling approachN. Lyutorovich0V. Tselyaev1J. Speth2S. Krewald3F. Grümmer4P.-G. Reinhard5Physical Faculty, St. Petersburg State University, RU-198504 St. Petersburg, RussiaPhysical Faculty, St. Petersburg State University, RU-198504 St. Petersburg, RussiaInstitut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, GermanyInstitut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, GermanyInstitut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, GermanyInstitut für Theoretische Physik II, Universität Erlangen-Nürnberg, D-91058 Erlangen, GermanyWe present fully self-consistent calculations of isoscalar giant monopole and quadrupole as well as isovector giant dipole resonances in heavy and light nuclei. The description is based on Skyrme energy-density functionals determining the static Hartree–Fock ground state and the excitation spectra within random-phase approximation (RPA) and RPA extended by including the quasiparticle-phonon coupling at the level of the time-blocking approximation (TBA). All matrix elements were derived consistently from the given energy-density functional and calculated without any approximation. As a new feature in these calculations, the single-particle continuum was included thus avoiding the artificial discretization usually implied in RPA and TBA. The step to include phonon coupling in TBA leads to small, but systematic, down shifts of the centroid energies of the giant resonances. These shifts are similar in size for all Skyrme parametrizations investigated here. After all, we demonstrate that one can find Skyrme parametrizations which deliver a good simultaneous reproduction of all three giant resonances within TBA.http://www.sciencedirect.com/science/article/pii/S0370269315006048Giant resonancesRandom-phase approximationPhonon coupling |
| spellingShingle | N. Lyutorovich V. Tselyaev J. Speth S. Krewald F. Grümmer P.-G. Reinhard Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach Physics Letters B Giant resonances Random-phase approximation Phonon coupling |
| title | Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach |
| title_full | Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach |
| title_fullStr | Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach |
| title_full_unstemmed | Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach |
| title_short | Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach |
| title_sort | isoscalar and isovector giant resonances in a self consistent phonon coupling approach |
| topic | Giant resonances Random-phase approximation Phonon coupling |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315006048 |
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