On the origin of the anomalous behaviour of 2+ excitation energies in the neutron-rich Cd isotopes

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dc.creatorRodríguez, Tomás R.
dc.creatorEgido, J. Luis
dc.creatorJungclaus, Andrea
dc.date2008-09-02
dc.date.accessioned2026-07-07T11:45:43Z
dc.date.available2026-07-07T11:45:43Z
dc.descriptionRecent experimental results obtained using $β$ decay and isomer spectroscopy indicate an unusual behaviour of the energies of the first excited 2$^{+}$ states in neutron-rich Cd isotopes approaching the N=82 shell closure. To explain the unexpected trend, changes of the nuclear structure far-off stability have been suggested, namely a quenching of the N=82 shell gap already in $^{130}$Cd, only two proton holes away from doubly magic $^{132}$Sn. We study the behaviour of the 2$^+$ energies in the Cd isotopes from N=50 to N=82, i.e. across the entire span of a major neutron shell using modern beyond mean field techniques and the Gogny force. We demonstrate that the observed low 2$^+$ excitation energy in $^{128}$Cd close to the N=82 shell closure is a consequence of the doubly magic character of this nucleus for oblate deformation favoring thereby prolate configurations rather than spherical ones.
dc.description10 pages, 4 figures, to be publised in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0809.0388
dc.identifierhttp://arxiv.org/abs/0809.0388
dc.identifierPhys.Lett.B668:410-413,2008
dc.identifierdoi:10.1016/j.physletb.2008.08.072
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201972
dc.subjectNuclear Theory
dc.titleOn the origin of the anomalous behaviour of 2+ excitation energies in the neutron-rich Cd isotopes
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