Programme

I.5 -- Invited, VCTP-44

Date: Monday, 29 July 2019

Time: 16:00 - 16:30

Renormalizing random-phase approximation by using exact pairing

L. Tan Phuc (1,2), N. Quang Hung (1), N. Dinh Dang (3)

(1) Institute of Fundamental and Applied Sciences, Duy Tan University, Vietnam. (2) Faculty of Physics and Engineering Physics, Vietnam National University Ho Chi Minh City-University of Science, Vietnam. (3) Quantum Hadron Physics Laboratory, RIKEN Nishina Center for Accelerator-Based Science, Japan.

We proposed a fully self-consistent renormalized random-phase approximation by using the self-consistent Hartree-Fock mean field plus exact pairing solutions (EP). Within this approach, the particle number is exactly conserved. The Pauli principle, which is violated in the conventional particle-hole random-phase approximation (RPA), is preserved, and the energies-weighted sum rule, which is violated in the conventional renormalized RPA, is restored. This approach is applied to calculate several light, medium, and heavy-mass nuclei, such as 22, 24, 28O, 60Ni, and 90Zr nuclei by using the MSk3 interaction. We found that taking into account ground-state correlations beyond the RPA by means of the occupation numbers obtained in EP affects the RPA solutions within the whole mass range, and this effect decreases with increasing the mass number. Moreover, the anti-pairing effect is also observed via a significant reduction of pairing in neutron-rich nuclei. The enhancement of Pygmy Dipole Resonance (PDR) is found in most of neutron-rich nuclei under consideration within our method.

Presenter: Le Tan Phuc