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17-21 novembre 2014
Institut Pluridisciplinaire Hubert Curien
Fuseau horaire Europe/Paris

Magicity of neutron rich isotopes: Lorentz tensor effect

19 nov. 2014 à 17:15
Amphithéâtre Grunwald (Institut Pluridisciplinaire Hubert Curien)

Amphithéâtre Grunwald

Institut Pluridisciplinaire Hubert Curien

23 rue du Loess Strasbourg
Théorie et modèles nucléaires Théorie et modèles nucléaires


M. Jiajie LI (IPN, Orsay)


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)


Dr Jerome Margueron (IPN, Lyon) Prof. Nguyen Van Giai (IPN, Orsay)

Documents de présentation

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