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중이온가속기구축사업단
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Isoscalar and neutron modes in the E1 spectra of Ni isotopes and the relevance of shell effects and the continuum

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dc.contributor.authorP. Papakonstantinounull
dc.contributor.authorHergert, H.null
dc.contributor.authorRoth, R.null
dc.date.accessioned2016-10-26T07:01:06Z-
dc.date.available2016-10-26T07:01:06Z-
dc.date.created2015-10-06null
dc.date.issued201509null
dc.identifier.issn0556-2813null
dc.identifier.urihttp://pr.ibs.re.kr/handle/8788114/2919-
dc.description.abstractWe study theoretically the electric dipole transitions of even Ni isotopes at low energies, using the self-consistent quasiparticle random-phase approximation with the D1S Gogny interaction and a continuum-RPA model with the SLy4 Skyrme force. We analyze isoscalar states, isovector states, and the dipole polarizability. We define a reference value for the polarizability to remove a trivial dependence on the mass number. We compare our results with data and other calculations, with a focus on collective states, shell effects, and threshold transitions. Our results support the presence of a strong isoscalar transition, with little or moderate E1 strength, as a universal feature of ordinary nuclei. In moderately neutron-rich Ni isotopes, namely Ni68 and neighboring isotopes, this transition is found bimodal due to couplings with surface neutrons. An adequate treatment of the continuum states appears essential for describing suprathreshold E1 strength, especially beyond Ni68. Very exotic isotopes (N>50) are found highly polarizable, with practically all their E1 strength in the continuum. The dipole polarizability and the neutron-skin thickness are influenced by shell structure in different ways, so they can appear anticorrelated. A comparison with existing results for lighter (Ca) and heavier (Sn) nuclei suggests that the so-called pygmy dipole strength is influenced strongly by shell effects and that, partly for that reason, its isospin structure depends on the mass region. © 2015 American Physical Societynull
dc.languageENGnull
dc.publisherAMER PHYSICAL SOCnull
dc.titleIsoscalar and neutron modes in the E1 spectra of Ni isotopes and the relevance of shell effects and the continuumnull
dc.typeARTICLEnull
dc.type.rimsAnull
dc.identifier.wosid000361118900002null
dc.identifier.scopusid2-s2.0-84942358035null
dc.identifier.pid341null
dc.identifier.doi10.1103/PhysRevC.92.034311null
dc.identifier.bibliographicCitationPHYSICAL REVIEW C, v.92, no.3, pp.034311-1 - 034311-14null
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