Relation of E1 pygmy and toroidal resonances
1 Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia
2 Institute of Particle and Nuclear Physics, Charles University, CZ-18000, Praha 8, Czech Republic
3 Institut für Theoretische Physik II, Universität Erlangen, D-91058, Erlangen, Germany
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Published online: 28 May 2015
A possible relation of low-lying E1 strength ("pygmy resonance") and toroidal strength is analyzed by using Skyrme random-phase-approximation (RPA) results for the strength functions, transition densities and current fields in 208Pb. It is shown that the irrotational pygmy motion can appear as a local manifestation of the collective vortical toroidal dipole resonance (TDR) at the nuclear surface. The RPA results are compared to unperturbed (1ph) ones.
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