dorsal/arxiv
View SchemaSelf-Consistent Separable Rpa for Skyrme Forces: Giant Resonances in Axial Nuclei
| Authors | V. O. Nesterenko, W. Kleinig, J. Kvasil, P. Vesely, P. -G. Reinhard, D. S. Dolci |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0609018 |
| URL | https://arxiv.org/abs/nucl-th/0609018 |
| DOI | 10.1103/PhysRevC.74.064306 |
| Journal | Phys.Rev. C74 (2006) 064306 |
Abstract
We formulate the self-consistent separable random-phase-approximation (SRPA) method and specify it for Skyrme forces with pairing for the case of axially symmetric deformed nuclei. The factorization of the residual interaction allows to avoid diagonalization of high-rank RPA matrices, which dramatically reduces the computational expense. This advantage is crucial for the systems with a huge configuration space, first of all for deformed nuclei. SRPA takes self-consistently into account the contributions of both time-even and time-odd Skyrme terms as well as of the Coulomb force and pairing. The method is implemented to description of isovector E1 and isoscalar E2 giant resonances in a representative set of deformed nuclei: $^{154}$Sm, $^{238}$U, and $^{254}$No. Four different Skyrme parameterizations (SkT6, SkM*, SLy6, and SkI3) are employed to explore dependence of the strength distributions on some basic characteristics of the Skyrme functional and nuclear matter. In particular, we discuss the role of isoscalar and isovector effective masses and their relation to time-odd contributions. High sensitivity of the right flank of E1 resonance to different Skyrme forces and the related artificial structure effects are analyzed.
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"abstract": "We formulate the self-consistent separable random-phase-approximation (SRPA)\nmethod and specify it for Skyrme forces with pairing for the case of axially\nsymmetric deformed nuclei. The factorization of the residual interaction allows\nto avoid diagonalization of high-rank RPA matrices, which dramatically reduces\nthe computational expense. This advantage is crucial for the systems with a\nhuge configuration space, first of all for deformed nuclei. SRPA takes\nself-consistently into account the contributions of both time-even and time-odd\nSkyrme terms as well as of the Coulomb force and pairing. The method is\nimplemented to description of isovector E1 and isoscalar E2 giant resonances in\na representative set of deformed nuclei: $^{154}$Sm, $^{238}$U, and $^{254}$No.\nFour different Skyrme parameterizations (SkT6, SkM*, SLy6, and SkI3) are\nemployed to explore dependence of the strength distributions on some basic\ncharacteristics of the Skyrme functional and nuclear matter. In particular, we\ndiscuss the role of isoscalar and isovector effective masses and their relation\nto time-odd contributions. High sensitivity of the right flank of E1 resonance\nto different Skyrme forces and the related artificial structure effects are\nanalyzed.",
"arxiv_id": "nucl-th/0609018",
"authors": [
"V. O. Nesterenko",
"W. Kleinig",
"J. Kvasil",
"P. Vesely",
"P. -G. Reinhard",
"D. S. Dolci"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.74.064306",
"journal_ref": "Phys.Rev. C74 (2006) 064306",
"title": "Self-Consistent Separable Rpa for Skyrme Forces: Giant Resonances in Axial Nuclei",
"url": "https://arxiv.org/abs/nucl-th/0609018"
},
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