Investigations of the decay of the three-particle state in ${\mathrm{Lu}}^{177}$ with spin 23/$2^{-}$ performed with the crystal diffraction technique revealed evidence for three-particle states in ${\mathrm{Hf}}^{177}$ and rotational bands in ${\mathrm{Lu}}^{177}$ and in ${\mathrm{Hf}}^{177}$. Levels with spins to 17/2 were found in the $K=\frac{7}{2^{+}}$ rotational band in ${\mathrm{Lu}}^{177}$ while the $K=\frac{7}{2^{-}}$ and $K=\frac{9}{2^{+}}$ bands in ${\mathrm{Hf}}^{177}$ were found to be excited up to spin 21/2 levels. From energy and intensity measurements of the cascade, crossover, and interband transitions, the values of a number of parameters pertinent to the collective model were derived. In particular, it was verified for each of the rotational bands that the quantity $\frac{(g_K-g_R)}{Q_0}$ was a constant within the experimental error.

• Received 3 September 1963

DOI:https://doi.org/10.1103/PhysRev.133.B284