Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach

Lyutorovich N, Tselyaev V, Speth J, Krewald S, Grümmer F, Reinhard PG (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Physics Letters B Elsevier

Book Volume: 749

Pages Range: 292-297

DOI: 10.1016/j.physletb.2015.08.003

Abstract

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.

Authors with CRIS profile

Paul-Gerhard Reinhard Naturwissenschaftliche Fakultät

Involved external institutions

Saint Petersburg State University (SPbU) / Санкт-Петербургский государственный университет (СПбГУ) RU Russian Federation (RU) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Lyutorovich, N., Tselyaev, V., Speth, J., Krewald, S., Grümmer, F., & Reinhard, P.-G. (2015). Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach. Physics Letters B, 749, 292-297. https://doi.org/10.1016/j.physletb.2015.08.003

MLA:

Lyutorovich, N., et al. "Isoscalar and isovector giant resonances in a self-consistent phonon coupling approach." Physics Letters B 749 (2015): 292-297.

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