Orateur
M.
Jiajie LI
(IPN, Orsay)
Description
The formation of new shell gaps in neutron-rich nuclei are investigated within relativistic Hartree-Fock-Bogoliubov theory and the role of Lorentz tensor is studied in detail.
We show that the global variation of the single-particle energy is due to the isoscalar component of the effective Lagrangian, while the characteristic behavior of the spin-orbit partner or pseudo-spin partner is due to its Lorentz tensor part.
Based on the Foldy-Wouthuysen transformation, we analyzed the role played by the different terms of the Lorentz tensor in the formation and/or quenching of the $N$ = 16, 32 and 34 shell gaps.
It is shown that the Lorentz tensor leads to the increasing of $N$ = 32 gap, when going along isotonic chains, from $^{60}$Ni to $^{52}$Ca. Whereas the increasing of $N$ = 34 gap from $^{62}$Ni to $^{54}$Ca is due, primarily, to the central term.
The relativistic model automatically produces the decreasing of $N$ = 16 gap from $^{30}$Si to $^{24}$O because it naturally includes the spin-orbit interaction and its isospin dependence, also the inclusion of the Lorentz tensor enlarge the energy difference.
Auteur principal
M.
Jiajie LI
(IPN, Orsay)
Co-auteurs
Dr
Jerome Margueron
(IPN, Lyon)
Prof.
Nguyen Van Giai
(IPN, Orsay)
