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  • The nature of E1 low-energy strength (LES), often denoted as a %22pygmy dipole resonance%22, is analyzed within the random-phase approximation (RPA) in Pb-208 using Skyrme forces in a fully self-consistent manner. A first overview is given by the strength functions for the dipole, compressional, and toroidal operators. More detailed insight is gained by averaged transition densities and currents where the latter provide a very illustrative flow pattern. The analysis reveals clear isoscalar toroidal flow in the low-energy bin 6.0-8.8 MeV of the LES and a mixed isoscalar/isovector toroidal/compression flow in the higher bin 8.8-10.5 MeV. Thus the modes covered by LES embrace both vortical and irrotational motion. The simple collective picture of the LES as a %22pygmy%22 mode (oscillations of the neutron excess against the nuclear core) is not confirmed. DOI: 10.1103/PhysRevC.87.024305
  • The nature of E1 low-energy strength (LES), often denoted as a %22pygmy dipole resonance%22, is analyzed within the random-phase approximation (RPA) in Pb-208 using Skyrme forces in a fully self-consistent manner. A first overview is given by the strength functions for the dipole, compressional, and toroidal operators. More detailed insight is gained by averaged transition densities and currents where the latter provide a very illustrative flow pattern. The analysis reveals clear isoscalar toroidal flow in the low-energy bin 6.0-8.8 MeV of the LES and a mixed isoscalar/isovector toroidal/compression flow in the higher bin 8.8-10.5 MeV. Thus the modes covered by LES embrace both vortical and irrotational motion. The simple collective picture of the LES as a %22pygmy%22 mode (oscillations of the neutron excess against the nuclear core) is not confirmed. DOI: 10.1103/PhysRevC.87.024305 (en)
Title
  • Toroidal nature of the low-energy E1 mode
  • Toroidal nature of the low-energy E1 mode (en)
skos:prefLabel
  • Toroidal nature of the low-energy E1 mode
  • Toroidal nature of the low-energy E1 mode (en)
skos:notation
  • RIV/00216208:11320/13:10191514!RIV14-GA0-11320___
http://linked.open...avai/predkladatel
http://linked.open...avai/riv/aktivita
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  • I, P(GA13-07117S), Z(MSM0021620859)
http://linked.open...iv/cisloPeriodika
  • 2
http://linked.open...vai/riv/dodaniDat
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  • 111296
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  • RIV/00216208:11320/13:10191514
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  • neutron; nuclei; sum-rules; dipole mode (en)
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  • US - Spojené státy americké
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  • [573EEB8817E1]
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  • Physical Review C - Nuclear Physics
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  • 87
http://linked.open...iv/tvurceVysledku
  • Kvasil, Jan
  • Nesterenko, V. O.
  • Reinhard, P. -G.
  • Repko, Anton
http://linked.open...ain/vavai/riv/wos
  • 000314684000003
http://linked.open...n/vavai/riv/zamer
issn
  • 0556-2813
number of pages
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  • 10.1103/PhysRevC.87.024305
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  • 11320
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