The Decay ofRh106

Beta-rays with maximum energies of 3.53±0.01, 3.1±0.1, 2.44±0.07, and 2.0±0.1 Mev and relative intensities of 68, 11, 12, and 3 percent, respectively, have been found with a lens spectrometer in the decay of ${\mathrm{Rh}}^{106}$. Internal conversion lines of 0.513 and 0.624 Mev transitions occur with intensities of 7.5×${10}^{-4\mathrm{}}$ and 2.3×${10}^{-4\mathrm{}}$ relative to total beta-emission. The first of these has a $\frac{K}{L}$ ratio of 7.8±1, indicating an electric quadrupole radiation. Lens and scintillation spectrometer measurements show that the gamma-ray spectrum consists of lines at 0.511, 0.621, 0.87, 1.045, 1.55, and 2.41 Mev with relative intensities of 100:53:3:8:2.5:1, respectively. The results are consistent with beta-decay to states in ${\mathrm{Pd}}^{106}$ at 0, 0.513, 1.137, 1.55, and 2.42 Mev having even parities and spins of 0, 2, 0, 2, and 2, respectively. ${\mathrm{Rh}}^{106}$ is assigned spin 1 and even parity. The possibility of explaining the gamma-gamma angular correlation of ${\mathrm{Rh}}^{106}$ based on this decay scheme is mentioned.