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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:00 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Theoretical Physics and Applied Mathematics
Title:
Pairing Correlations in N=Z Nuclei
Authors:
Daniel Ciprian Negrea, Nicolae Sandulescu, Bogdan Vivirschi
Affiliation:
DEPARTMENT OF THEORETICAL PHYSICS, IFIN-HH
E-mail
negrea_daniel2000@yahoo.com
Keywords:
isovector pairing, correlation energy, BCS model, PBCS approximation, SO(5) model.
Abstract:
We study various approximations for the isovector pairing in N=Z nuclei. It is shown that the BCS model is not able to describe well the pairing correlation energies and the staggering of odd-even mass difference along N=Z line. A significant improvement is obtained in the PBCS approximation with two pair condensates, one formed by neutron-proton pairs and the other by neutron-neutron and proton-proton pairs. It is finally shown that a quartet-type wave function, which restore the isospin symmetry, gives very accurate results. The performance of all approximations mentioned above is analysed in an exactly solvable SO(5)model.
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