Gyromagnetic ratios of low-lying excited states in Pt196

The gyromagnetic ratios of the 22+ and 41+ states in Pt196 were measured relative to that of its 21+ level. The thin-foil ion-implantation perturbed-angular-correlation technique was employed utilizing the enhanced transient hyperfine magnetic field present at the nuclei of swiftly recoiling ions traversing magnetized ferromagnetic materials. The states of interest were populated by Coulomb excitation using beams of 220-MeV Ni58 ions. For g(21+) taken as 0.3260.014, the present measurements yielded g(22+)=0.300.06 and g(41+)=0.300.05. These results and those reported by prior workers for the g factors of corresponding states in Pt192, Pt194, and Pt198 are used to trace the systematics of the gyromagnetic ratios of these low-lying levels in the even Pt192-198 isotopes. These experimental findings are compared in detail with interacting boson approximation model-based predictions. NUCLEAR REACTIONS Pt196(Ni,Ni') Pt196(21+,22+,41+), E=220 MeV; measured (,H) in polarized Fe, particle- coin, Coulomb excitation. Pt196 levels deduced g. Enriched target, thin foil technique. NUCLEAR STRUCTURE Pt192,194,196,198; calculated g. Interacting boson approximation, near-0(6) limit.