This title appears in the Scientific Report :
2018
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevC.96.024312 in citations.
Please use the identifier: http://hdl.handle.net/2128/19768 in citations.
Optimizing phonon space in the phonon-coupling model
Optimizing phonon space in the phonon-coupling model
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...
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Personal Name(s): | Tselyaev, V. |
---|---|
Lyutorovich, N. / Speth, J. (Corresponding author) / Reinhard, P.-G. | |
Contributing Institute: |
Theorie der starken Wechselwirkung; IKP-3 Theorie der Starken Wechselwirkung; IAS-4 |
Published in: | Physical Review C Physical review / C, 96 96 (2017 2017) 2 2, S. 024312 024312 |
Imprint: |
Woodbury, NY
Inst.
2017
2017-08-18 2017-08-01 |
DOI: |
10.1103/PhysRevC.96.024312 |
Document Type: |
Journal Article |
Research Program: |
Computational Science and Mathematical Methods |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/19768 in citations.
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. |