Mean Life of the 538-keV State inRh103

The mean life of the 538-keV state in ${\mathrm{Rh}}^{103}$ is determined, using a time-to-pulse-height converter of the Green and Bell type and of resolving time 0.76 nsec. RCA 6810A photomultipliers in conjunction with NE 102 plastic phosphors are employed for $\beta$ and $\gamma$ detection, and a $\beta -\gamma$ coincidence method together with the centroid-shift technique is used to obtain the mean life as (5.6±1.8)×${10}^{-11\mathrm{}}$ sec. This value of the mean life is employed to estimate the $\gamma$ transition probabilities for the 498-keV transition, assuming it to be pure $M1\mathrm{}$, $50\%M1+50\%E2\mathrm{}$, and pure $E2\mathrm{}$, and is compared with the single-particle estimates. The 538-keV state does not seem to arise from a ${\left(g_{\frac{9}{2}}\right)}^{5\mathrm{o}\mathrm{r}7}$ configuration.