Optimizing phonon space in the phonon-coupling model

Tselyaev V, Lyutorovich N, Speth J, Reinhard PG (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Physical Review C - Nuclear Physics American Physical Society

Book Volume: 96

Article Number: 024312

Journal Issue: 2

DOI: 10.1103/PhysRevC.96.024312

Abstract

We present a new scheme to select the most relevant phonons in the phonon-coupling model, named here the time-blocking approximation (TBA). The new criterion, based on the phonon-nucleon coupling strengths rather than on B(EL) values, is more selective and thus produces much smaller phonon spaces in the TBA. This is beneficial in two respects: first, it curbs the computational cost, and second, it reduces the danger of double counting in the expansion basis of the TBA. We use here the TBA in a form where the coupling strength is regularized to keep the given Hartree-Fock ground state stable. The scheme is implemented in a random-phase approximation and TBA code based on the Skyrme energy functional. We first explore carefully the cutoff dependence with the new criterion and can work out a natural (optimal) cutoff parameter. Then we use the freshly developed and tested scheme for a survey of giant resonances and low-lying collective states in six doubly magic nuclei looking also at the dependence of the results when varying the Skyrme parametrization.

Authors with CRIS profile

Paul-Gerhard Reinhard Naturwissenschaftliche Fakultät

Involved external institutions

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

How to cite

APA:

Tselyaev, V., Lyutorovich, N., Speth, J., & Reinhard, P.-G. (2017). Optimizing phonon space in the phonon-coupling model. Physical Review C - Nuclear Physics, 96(2). https://doi.org/10.1103/PhysRevC.96.024312

MLA:

Tselyaev, V., et al. "Optimizing phonon space in the phonon-coupling model." Physical Review C - Nuclear Physics 96.2 (2017).

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