Low-Energy Nuclear Physics Seminar

Date and Time: Friday, 18 June 2021, at 2:30 PM

Venue: Online conference in Zoom, Bogoliubov Laboratory of Theoretical Physics

Link to join the seminar

Seminar topic: «Self-consistent study of nuclear charge radii in Ca region»

Authors: I.N. Borzov^1,2, S.V. Tolokonnikov^1,3
1 – National Research Centre “Kurchatov Institute”, Moscow
¹ – Bogoliubov Laboratory of Theoretical Physics JINR
¹ – Moscow Institute of Physics and Technology (State University), Dolgoprudny

Speaker: I.N. Borzov

Abstract:

Fully self-consistent study of the charge radii in the long chains of the Ar to Sc isotopes will be presented. The neutron-deficient and neutron-rich nuclei with pairing in both neutron and proton sectors, as well as the (semi-) magic nuclei around the closed neutron shells at N=20, 28, 32 are treated within the Energy Density Functional (EDF) approach with the Fayans functional DF3-a. A comparison with its new options is done, namely with Fy(stand) and more recent Fy(?r,HFB). The performance of the DF3-a will be discussed in describing both absolute radii and OES effects found in the CERN-ISOLDE experiments for 36-52Ca and 36-52K isotopes. In addition to a large-scale parametric fitting of the Fayans EDF, possible improvements will be mentioned:

– extension of the framework for deformed nuclei;
– introducing a modified density gradient term in pairing EDF;
– self-consistent account for the A-dependent fluctuating contribution due to the quasiparticle-phonon coupling.

The latter explains strong increase of the radii at N>28 in Ca isotopes.