Transient hyperfine field measurements of gyromagnetic ratios in Os and Pt nuclei

Abstract

Precessions were measured of the ${2}_{1}^{+}$ states in $^{192}\mathrm{Os}$ and $^{198}\mathrm{Pt}$ in the enhanced transient field in thin cobalt foils and comparison made with similar recent studies of $^{188}\mathrm{Os}$ and $^{194}\mathrm{Pt}$ ions in Fe foils. It is concluded that (i) the transient field acting on Pt in Fe is singularly anomalous, and (ii) recent contention by Levy et al. that the $g$ factors of even Pt ${2}_{1}^{+}$ states may be substantially lower than reported earlier cannot be sustained.NUCLEAR REACTIONS $^{192}\mathrm{Os}$($^{32}\mathrm{S}$, $^{32}\mathrm{S}$\ensuremath{'}) $^{192}\mathrm{Os}$(${2}_{1}^{+}$), $^{192}\mathrm{Os}$($^{58}\mathrm{Ni}$, $^{58}\mathrm{Ni}$\ensuremath{'})- $^{192}\mathrm{Os}$(${2}_{1}^{+}$), $^{198}\mathrm{Pt}$($^{32}\mathrm{S}$, $^{32}\mathrm{S}$\ensuremath{'}) $^{198}\mathrm{Pt}$(${2}_{1}^{+}$), $^{198}\mathrm{Pt}$($^{58}\mathrm{Ni}$, $^{58}\mathrm{Ni}$\ensuremath{'}) $^{198}\mathrm{Pt}$(${2}_{1}^{+}$), ${E}_{\mathrm{S}}=80$ MeV, ${E}_{\mathrm{Ni}}=220$ MeV, enriched targets; measured $W(\ensuremath{\theta}, H, T)$ in thin polarized Co. Deduced relative transient field strengths $\mathrm{Os}\mathrm{Co}$ and $\mathrm{Pt}\mathrm{Co}$, $\mathrm{Os}\mathrm{Fe}$ and $\mathrm{Pt}\mathrm{Fe}$ for $1.5%<~\frac{v}{c}<~3.9%$, deduced $g({2}_{1}^{+})$ even Pt isotopes.