Magnetic Dipole Moments of the First $2^{+}$ States in ${\mathrm{Os}}^{192}$ and ${\mathrm{Pt}}^{192}$; Room-Temperature Nuclear-Magnetic-Resonance Measurement of the Os Hyperfine Field in Fe and Ni Hosts

The magnetic dipole moments of the first $2^{+}$ states in ${\mathrm{Os}}^{192}$ and ${\mathrm{Pt}}^{192}$ have been measured, using integral perturbed-angular-correlation (PAC) methods, to be $\mu =0.797\mathrm{}\pm 0.036{\mu }_N$ and $\mu =0.90\mathrm{}\pm 0.11{\mu }_N$, respectively. Integral PAC measurements were performed using both Fe(Ir) and Ni(Ir) alloys, and it has been established that the Fe(Ir) alloy is not a suitable environment for a PAC experiment. Significantly, the results agree with the $2\left(\frac{Z}{A}\right)$ hydrodynamical values, but differ appreciably from the predictions of the Kumar and Baranger pairing-plus-quadru-pole model. The room-temperature internal magnetic fields of ${\mathrm{Os}}^{187}$ in Fe and Ni lattices have been measured by steady-state NMR methods to be $H_{\mathrm{int}}\left(296\mathrm{}°\mathrm{K}\right)=-1093.43\mathrm{}\pm 0.65$ kOe and $H_{\mathrm{int}}\left(295\mathrm{}°\mathrm{K}\right)=-282.3\mathrm{}\pm 1.0$ kOe, respectively.