The gyromagnetic ratios of the $2_2^{+}$ and $4_1^{+}$ states in ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}$ were measured relative to that of its $2_1^{+}$ 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 ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ ions. For $g\left(2_1^{+}\right)$ taken as 0.326±0.014, the present measurements yielded $g\left(2_2^{+}\right)=0.30\mathrm{}\pm 0.06$ and $g\left(4_1^{+}\right)=0.30\mathrm{}\pm 0.05$. These results and those reported by prior workers for the $g$ factors of corresponding states in ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pt}$, ${}_{}{}^{194}{}_{}{}^{}\mathrm{Pt}$, and ${}_{}{}^{198}{}_{}{}^{}\mathrm{Pt}$ are used to trace the systematics of the gyromagnetic ratios of these low-lying levels in the even ${}_{}{}^{192-198}{}_{}{}^{}\mathrm{Pt}$ isotopes. These experimental findings are compared in detail with interacting boson approximation model-based predictions.

NUCLEAR REACTIONS ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}$(Ni,Ni') ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}$($2_1^{+}$,$2_2^{+}$,$4_1^{+}$), $E=220\mathrm{}$ MeV; measured $\gamma (\theta ,H)$ in polarized Fe, particle-$\gamma$ coin, Coulomb excitation. ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}$ levels deduced $g$. Enriched target, thin foil technique. NUCLEAR STRUCTURE ${}_{}{}^{192,194,196,198}{}_{}{}^{}\mathrm{Pt}$; calculated $g$. Interacting boson approximation, near-0(6) limit.

• Received 22 July 1981

DOI:https://doi.org/10.1103/PhysRevC.24.2106