Excited states in ${}_{}{}^{105}{}_{}{}^{}\mathrm{Pd}$ have been populated using the reaction ${}_{}{}^{96}{}_{}{}^{}\mathrm{Zr}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, 3n\gamma ){}_{}{}^{105}{}_{}{}^{}\mathrm{Pd}$. A new multiple-detector coincidence technique has resulted in greatly improved $\gamma -\gamma$ coincidence statistics. Aligned members of particlecore multiplets observed formed $\Delta I=2\mathrm{}$ bands built on $\frac{11}{2^{-}}$ and $\frac{7}{2^{+}}$ states. Many other nonaligned members of multiplets were observed as well. A $\Delta I=1\mathrm{}$ band built on the $\frac{5}{2^{+}}$ ground state was also observed which has no counterpart in lighter Pd nuclei. All of these states have been successfully described by a general rotational model which assumes that ${}_{}{}^{105}{}_{}{}^{}\mathrm{Pd}$ is a slightly deformed nucleus. The model includes a full treatment of Coriolis effects and a variable moment of inertia.

NUCLEAR STRUCTURE ${}_{}{}^{96}{}_{}{}^{}\mathrm{Zr}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, 3n\gamma )$, $E=45\mathrm{}$ MeV; measured $I_{\gamma }\left[E\right({}_{}{}^{12}{}_{}{}^{}\mathrm{C}\left)\right]$, $I_{\gamma }\left(\theta \right)$, $\gamma -\gamma$ coin, $\gamma -\gamma$-direct. corr., oriented nucl. ${}_{}{}^{105}{}_{}{}^{}\mathrm{Pd}$ deduced levels, $J$,$\pi$, $\gamma$ multipolarity. Compared with rotational model.

• Received 12 April 1976

DOI:https://doi.org/10.1103/PhysRevC.15.1530