The recoilless nuclear resonance absorption of the $\gamma$ rays from the 86.5- and 105.3-keV states in ${\mathrm{Gd}}^{155}$ has been studied to determine the spins, the quadrupole moments, and magnetic moments of these states. The following quantities were determined: $I\left(105.3\right)=\frac{3}{2}$, $\left|\frac{Q\left(86.5\right)\mathrm{}}{Q\left(0\right)\mathrm{}}\right|=0.20\mathrm{}\pm 0.10$, $0.80<\mathrm{}\frac{Q\left(105.3\right)\mathrm{}}{Q\left(0\right)\mathrm{}}\lesssim 1.00$, $\mu \mathrm{}\left(86.5\right)=-0.53\mathrm{}\pm 0.05{\mu }_N$, and $\mu \mathrm{}\left(105.3\right)=0.13\mathrm{}\pm 0.04{\mu }_N$ or $-0.38\mathrm{}\pm 0.06{\mu }_N$. The results imply strong bandmixing in the 86.5-keV state and $I\left(86.5\right)=\frac{5}{2}$.

• Received 2 January 1968

DOI:https://doi.org/10.1103/PhysRev.170.1076