# Rencontres Jeunes Chercheurs 2014

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
30m
Amphithéâtre Grunwald (Institut Pluridisciplinaire Hubert Curien)

### Amphithéâtre Grunwald

#### Institut Pluridisciplinaire Hubert Curien

23 rue du Loess Strasbourg
Théorie et modèles nucléaires

### 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)

### Documents de présentation

Aucun document.
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