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MPINP:
Präzisionsexperimente - Abteilung Blaum
Abstract:
Magnetic and quadrupole moments of the 7/2+ ground state in 133Sb and the (7−) isomer in 134Sb have been measured by collinear laser spectroscopy to investigate the single-particle behavior above the doubly magic nucleus 132Sn. The comparison of experimental data of the 7/2+ states in 133Sb and neighboring N=82 isotones to shell-model calculations reveals the sensitivity of magnetic moments to the splitting of the spin-orbit partners π0g9/2 and π0g7/2 across the proton shell closure at Z=50. In contrast, quadrupole moments of the N=82 isotones are insensitive to cross-shell excitations, but require the full proton model space from Z=50 to 82 for their accurate description. In fact, the linear trend of the quadrupole moment follows approximately the expectation of the seniority scheme when filling the π0g7/2 orbital. As far as the isomer in 134Sb is concerned, its electromagnetic moments can be perfectly described by the additivity rule employing the moments of 133Sb and 133Sn, respectively. These findings agree with shell-model calculations and thus confirm the weak coupling between the valence proton and neutron in 134Sb.
