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AbstractAbstract
[en] Mass spectrometer measurements of the neutron rich sodium isotopes show a sudden increase at 31Na in the values of the two neutron separation energies. The spherical shell model naturally predicts a sudden decrease at 32Na after the N=20 shell closure. It is proposed that the explanation for this disagreement lies in the fact that sodium isotopes in this mass region are strongly deformed due to the filling of negative parity orbitals from the 1f(7/2) shell. Hartree-Fock calculations are presented in support of this conjecture
[fr]
Des experiences mesurant la masse des sodium riches en neutrons montrent qu'il apparait pour 31Na un accroissement de la valeur des energies de separation de deux neutrons. Le modele en couche spherique predit une decroissance pour 32Na le noyau immediatement apres la fermeture de couche N=20. On suggere que ce desaccord peut etre explique en tenant compte de l'apparition dans cette region de la table des elements, de configurations fortement deformees dues au remplissage d'orbites de parite negative provenant du niveau 1f(7/2). On presente des calculs Hartree-Fock qui confirment cette hypothesePrimary Subject
Source
1975; 6 p; 5. International conference on atomic masses and fundamental constants (AMCO-5); Paris, France; 02 Jun 1975
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Conference
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