Speaker
Description
The nature of isotopic anomalies in charge radii and atomic isomer shifts
at N=126 region.
I.N. Borzov, 1, 2, S.S. Pankratov, 1,3
1) National Research Centre”Kurchatov Institute”, Moscow, Russia
2) Bogolubov Laboratory of Theoretical Physics, JINR, Dubna, Russia
3) Moscow Institute of Physics and Technology, Dolgoprydny, Russia
The nuclear charge ms-radii and atomic isomer shift for the 211-219Bi isotopes are calculated within the self-consistent finite Fermi systems theory using the Fayans functional FaNDF0. A special attention is paid to the anomalous part of the functional. In contrast to our previous calculations [1], the full Hartree-Fock-Bogolubov (HFB) formalism is employed with the non-diagonal pairing.
The main impact on the kink in the isotopic dependence of radii at N=126, as well as on the isomer shifts comes from the occupancy factors of the neutron discrete and continuum quasiparticle states with principal quantum number n = 1, as well as the neutron pairing contribution to the proton central mean field potential. In contrast, in the RMF framework [2] the kink is determined exclusively by the contribution of the ν1i11/2 orbital assuming it is inverted with respect to the ν2g9/2 orbital which is not supported by the experiment. Importantly, our calculations successfully describe the unexpected negative isomer shift in 215Bi observed recently at ISOLDE (CERN) [3].
- I.N. Borzov, S.V. Tolokonnikov, Physics of Atomic Nuclei 87, 423 (2024).
- U. C. Perera , A. V. Afanasjev, and P. Ring. Phys.Rev. C 104, 064313 (2021).
- M.D. Seliverstov, A. Barzakh, D. Fedorov, P. Molkanov, and V. Panteleev,
Proceedings of the XXIV International Conference “Nucleus -2024”, 1–5 July (Dubna, 2024).
