Toroidal resonance: Relation to pygmy mode, vortical properties, and anomalous deformation splitting


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Abstract

We review a recent progress in investigation of the isoscalar toroidal dipole resonance (TDR). A possible relation of the TDR and low-energy dipole excitations (also called a pygmy resonance) is analyzed. It is shown that the dipole strength in the pygmy region can be understood as a local manifestation of the collective vortical toroidalmotion at the nuclear surface. Application of the TDR as a measure of the nuclear dipole vorticity is discussed. An anomalous splitting of the TDR in deformed nuclei is inspected.

About the authors

P.-G. Reinhard

Institut für Theoretische Physik II

Email: nester@theor.jinr.ru
Germany, Erlangen

V. O. Nesterenko

Laboratory of Theoretical Physics

Author for correspondence.
Email: nester@theor.jinr.ru
Russian Federation, Dubna

J. Kvasil

Institute of Particle and Nuclear Physics

Email: nester@theor.jinr.ru
Czech Republic, Prague

A. Repko

Department of Nuclear Physics

Email: nester@theor.jinr.ru
Slovakia, Bratislava

W. Kleinig

Laboratory of Theoretical Physics

Email: nester@theor.jinr.ru
Russian Federation, Dubna

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