Toroidal nature of the low-energy E1 mode

Repko A, Reinhard PG, Nesterenko VO, Kvasil J (2013)

Publication Type: Journal article

Publication year: 2013

Journal

Physical Review C - Nuclear Physics American Physical Society

Book Volume: 87

Article Number: 024305

Journal Issue: 2

DOI: 10.1103/PhysRevC.87.024305

Abstract

The nature of E1 low-energy strength (LES), often denoted as a "pygmy dipole resonance", is analyzed within the random-phase approximation (RPA) in 208Pb 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 "pygmy" mode (oscillations of the neutron excess against the nuclear core) is not confirmed. © 2013 American Physical Society.

Authors with CRIS profile

Paul-Gerhard Reinhard Naturwissenschaftliche Fakultät

Involved external institutions

Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) Joint Institute for Nuclear Research (JINR) / Объединённый институт ядерных исследований (ОИЯИ) RU Russian Federation (RU)

How to cite

APA:

Repko, A., Reinhard, P.-G., Nesterenko, V.O., & Kvasil, J. (2013). Toroidal nature of the low-energy E1 mode. Physical Review C - Nuclear Physics, 87(2). https://doi.org/10.1103/PhysRevC.87.024305

MLA:

Repko, A., et al. "Toroidal nature of the low-energy E1 mode." Physical Review C - Nuclear Physics 87.2 (2013).

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