γ−γDirectional Correlations in the Decay ofIr192

$\gamma -\gamma$ directional correlations have been measured for the following cascades in the decay of 74-day ${}_{}{}^{192}{}_{}{}^{}\mathrm{Ir}$: 468-417 keV, $A_2=-0.12\mathrm{}\pm 0.03$, $A_4=0.11\mathrm{}\pm 0.06$, $\left|\delta \right| \left(417\mathrm{} \mathrm{keV}\right)>\mathrm{}8\mathrm{}$; 588-612 keV, $A_2=0.09\mathrm{}\pm 0.03$; 604-316 keV, $A_2=-0.49\mathrm{}\pm 0.03$, $\delta \left(604\mathrm{} \mathrm{keV}\right)\approx 2$; 308-612 keV, $A_2=-0.10\mathrm{}\pm 0.02$, $\delta \left(308\mathrm{} \mathrm{keV}\right)=-8\mathrm{}\pm 2$; 588-296 keV, $A_2=0.00\mathrm{}\pm 0.03$, $\delta \left(296\mathrm{} \mathrm{keV}\right)>\mathrm{}4\mathrm{} or <-20\mathrm{}$; 484-206 keV, $A_2=-0.28\mathrm{}\pm 0.03$, $\delta \left(484\mathrm{} \mathrm{keV}\right)=10\mathrm{}(+10,-3\mathrm{})\mathrm{}$; 374-206 keV, $A_2=0.10\mathrm{}\pm 0.03$. The results (1) support spin assignments of 3 and 4 for the 921- and 1200-keV levels, respectively, in ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pt}$, (2) are consistent with spin 4 for the 580-keV level in ${}_{}{}^{192}{}_{}{}^{}\mathrm{Os}$, and (3) indicate spin 3 for the 690-keV level in ${}_{}{}^{192}{}_{}{}^{}\mathrm{Os}$.