Effects of complex configurations in the structure of exotic nuclei


Bogoliubov Laboratory of Theoretical Physics

Seminar on Nuclear Theory

Date and Time: Monday, 18 October 2021, at 3:30 PM

Venue: Blokhintsev lecture hall (2nd floor), Bogoliubov Laboratory of Theoretical Physics, online seminar on Zoom

Seminar topic: “Effects of complex configurations in the structure of exotic nuclei”

Authors: N. N. Arsenyev1, V. V. Voronov1, N. V. Giai2, N. Pietralla3, A. P. Severyukhin1, Ch. Stoyanov4

1 – Bogoliubov Laboratory of Theoretical Physics JINR, Dubna
2 – Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
3 – Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany
4 – Institute of Nuclear Research and Nuclear Energy, BAS, Sofia, Bulgaria

Speaker: A. P. Severyukhin


The study of the properties of medium-heavy and heavy nuclei far from the stability line requires to develop new theoretical approaches. In the series of works, making use of the energy density functional we have elaborated a new method allowing constructing the separable form of the nuclear Hamiltonian. The method enables one to perform the calculations in very large configurational spaces. The generalized equations of the quasiparticle-phonon model were used to analyse low-energy spectra of neutron-rich nuclei, in particular, the mixed-symmetry states. The ifluence of complex configurations on the characteristics of giant and pygmy resonances was investigated. For the first time, we have studied the properties of the double-γ decay of the lowest quadrupole state. It was shown that the γγ-decay width is sensitive to the mixing of the simple and complex configurations. The generalized electric dipole polarisability is discussed as a new observable (to be nominated for the JINR Prize 2021).