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Comptes Rendus Physique
Volume 4, n° 4-5
pages 529-535 (01 mai 2003-02 février 18695)
Doi : 10.1016/S1631-0705(03)00054-9
Pairing and quartetting in exotic nuclei

Piet  Van Isacker
GANIL, BP 55027, 14076 Caen cedex 5, France 

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A review is given of pair correlations in nuclei with an emphasis on the symmetry character of the superfluid solution which depends on (i) the isospin of the nucleus and (ii) the relative strength of the   and   pairing forces. The most general SO(8) model which accommodates neutrons and protons as well as   and   pairing, is solvable in three limits: only   pairing, only   pairing and equal strengths in the two channels. In these limits, the superfluid ground-state solution of   nuclei exhibits a quartet structure. The competition between superfluidity and magicity is discussed with reference to integrable models. To cite this article: P. Van Isacker, C. R. Physique 4 (2003).

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Cette contribution passe en revue les différentes solutions superfluides qui existent dans le noyau. Une attention particulière est consacrée à leur charactère de symétrie qui dépend (i) de l'isospin du noyau et (ii) du rapport des forces d'appariement   et  . Un modèle général avec neutrons et protons et avec appariement   et   est analytiquement soluble dans trois limites : sans appariement  , sans appariement   et avec forces d'appariement égales. Les solutions analytiques démontrent l'existence d'une solution superfluide avec une structure en quartettes pour les noyaux  . La compétition entre fluidité et magicité est examinée dans le contexte d'un modèle intégrable. Pour citer cet article : P. Van Isacker, C. R. Physique 4 (2003).

Mots clés  : Nuclear physics ; Many-body correlations ; Pairing ; Clusters.

Mots clés  : Physique nucléaire ; Corrélations ; Appariement ; Aggrégats.




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