Speaker
Description
The toroidal dipole resonance (TDR) is a remarkable example of the electric intrinsic vortical flow in nuclei [1-3]. In conventional hydrodynamics of gases and liquids, such a flow is known as a Hill’s vortex ring. TDR is a general feature of atomic nuclei independently on their mass number and shape. However, the unambiguous observation of the toroidal mode is yet a demanding task for the modern experiment.
We report a recent prediction of E1 toroidal mode in low-energy dipole states of 58Ni. The prediction is based on the data of inelastic scattering experiments with photons, electrons and protons [4,5]. The main attention is paid to (e,e’) data.
The major part of TDR is located at the same energy region as the pygmy dipole resonance (PDR) which is crucially important for various astrophysical problems and building the equation of state [1,2]. The interplay between PDR and TDR is discussed. As the relevant examples, dipole excitations in 40Ca and 48Ca are considered.
[1] V.O. Nesterenko, J. Kvasil, A. Repko, W. Kleinig, and P.-G. Reinhard, Phys. Atom. Nucl. 79, n.6, 842 (2016).
[2] A. Repko, V.O. Nesterenko, J. Kvasil, and P.-G. Reinhard, Eur. Phys. J. A 55, 242 (2019).
[3] V.O. Nesterenko, A. Repko, J. Kasil, and P.-G. Reinhard, Phys. Rev. Lett. 120, n.18, 182501 (2018).
[4] I. Brandherm, P. von Neumann-Cosel, R. Mancino, G. Martinez-Pinedo, H. Matsubara, V. Yu. Ponomarev, A. Richter, M. Scheck, and A. Tamii, Phys. Rev. C 110, 034319 (2024).
[5] P. von Neumann-Cosel, V.O. Nesterenko, I. Brandherm, P.I. Vishnevskiy, P.-G. Reinhard, J. Kvasil, H. Matsubara, A. Repko, A. Richter, M. Scheck and A. Tamii, arXiv:2310.04736v5[nucl-ex], accepted by Phys. Rev. Lett.
