The (6+) isomer in 102Sn revisited: Neutron and proton effective charges close to the double shell closure.

In a high-energy fragmentation experiment at GSI an I = π (6 +) isomer and its γ -decay are identified in 102Sn, the two-neutron neighbour of the doubly-magic 100Sn. Its half-life is measured to be T = 1 / 2 367 (11) ns. The possible existence of further isomers is discussed in the framework of large-scale shell model (LSSM) calculations including up to five particle-hole excitations of the 100Sn core. From the precise B(E2; 6 + → 4 +) strength and the recently remeasured value for B(E2; 8 + → 6 +) in the two-proton hole neighbour 98Cd effective E2 polarization charges for protons and neutrons were inferred including LSSM corrections within the full N=4 0 ħ ω space. The results are discussed in comparison to predicted and empirically determined effective operators. [ABSTRACT FROM AUTHOR]