Speaker
Description
In early (e,e') experiments of TU-Darmstadt group, some dipole states at 8-11 MeV in 58Ni
demonstrate enhanced transverse form factors. In this connection, we explored a possible toroidal
nature of these states using the fully self-consistent Quasiparticle Random-Phase Approximation
approach with Skyrme forces SVbas, SkM* and SLy6. The main attention was paid to well assigned
8.24 MeV 1- state. Various characteristics of the dipole states were analyzed. The calculations
show that several 1- states at 8-11 MeV can indeed be toroidal. The available (e, e') data for
8.24-MeV 1- state are well described within the Plane Wave Born Approximation. A tentative
prescription to distinguish toroidal states from irrotational ones is proposed. To our knowledge,
8.24-MeV 1- state in 58Ni is the first individual toroidal state proposed for spherical nuclei.
