The in-beam conversion-electron spectrum for the reaction ${}_{}{}^{154}{}_{}{}^{}\mathrm{Sm}(\alpha , 4n){}_{}{}^{154}{}_{}{}^{}\mathrm{Gd}$ has been obtained at 45 MeV. Strong $E0\mathrm{}$ components are observed for interband transitions between states in the $\beta$ and ground bands up to at least spin 10 and probably also spin 12. The ratio of transition probabilities, $E0\mathrm{}$ to $E2\mathrm{}$, is found to be essentially constant for $I_{\beta }$ in the range 2 to 10. No evidence for a dramatic change which might be associated with the backbending phenomenon is seen.

NUCLEAR REACTIONS ${}_{}{}^{154}{}_{}{}^{}\mathrm{Sm}(\alpha , 4n)$, $E=45\mathrm{}$ MeV, enriched target; measured in-beam $I_{\mathrm{ce}}$, $I_{\gamma }$. ${}_{}{}^{154}{}_{}{}^{}\mathrm{Gd}$ deduced ICC, $\frac{B\left(E0\mathrm{}\right)\mathrm{}}{B\left(E2\mathrm{}\right)\mathrm{}}$.

• Received 26 August 1974

DOI:https://doi.org/10.1103/PhysRevC.10.2460