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Pseudospin, supersymmetry and the shell structure of atomic nuclei
Typel S.
Nuclear Physics A 806 (2008) 156-178 - http://hal.in2p3.fr/in2p3-00273375
Physique/Physique Nucléaire Théorique
Pseudospin, supersymmetry and the shell structure of atomic nuclei
S. Typel1
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
The evolution of single-particle energies with varying isospin asymmetry in the shell model is an important issue when predicting changes in the shell structure for exotic nuclei. In many cases pseudospin partner levels, that are almost degenerate in energy for stable nuclei, are relevant in extracting the size of the shell gaps. A breaking of the pseudospin symmetry can affect the size of these gaps and change the magic numbers accordingly. The strength of the pseudospin splitting is expected to depend in particular on isovector-dependent and tensor contributions to the effective nuclear interaction. A description employing supersymmetric quantum mechanics allows to derive a pseudospin symmetry breaking potential that is regular in contrast to the pseudospin-orbit potential in the conventional relativistic treatment. The derived perturbation potential provides a measure to quantify the symmetry breaking and it can be employed to improve mean-field calculations in order to better reproduce the experimentally observed shell evolution. General potentials with exact pseudospin symmetry are obtained that can be used in relativistic mean-field Hamiltonians.

Articles dans des revues avec comité de lecture
2008
Nuclear Physics A (Nucl. Phys. A)
Publisher Elsevier
ISSN 0375-9474 
806
156-178

11.30.Pb, 21.10.Pc, 21.30.Fe, 21.60.Cs
pseudospin symmetry – supersymmetry – shell model – relativistic mean field model – single-particle states
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0802.0929