Individual dipole toroidal states in 58Ni
Seminars
Low-Energy Nuclear Physics Department Seminar
Date and Time: Tuesday, 12 April 2022, at 11:00 AM
Venue: Blokhinstev Conference Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics; online on Zoom
Seminar topic: “Individual dipole toroidal states in 58Ni”
Authors: V. O. Nesterenko1,2, P. I. Vishnevskiy1,2,3, P. von Neumann-Cosel4, A. Repko5, J. Kvasil6
1 – Laboratory of Theoretical Physics JINR
2 – Dubna State University
3 – Institute of Nuclear Physic Almaty, Almaty Region, Kazakhstan
4 – Institut fur Kernphysik, TU Darmstadt, Darmstadt, Germany
5 – Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
6 – Institute of Particle and Nuclear Physics, Charles University, Praha
Speaker: P. I. Vishnevskiy
Abstract:
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.