New transitions and levels in ${}^{148}\mathrm{Ce}$ have been observed in a $\gamma \text{−}\gamma \text{−}\gamma$ coincidence study from the spontaneous fission of ${}^{252}\mathrm{Cf}$ with Gammasphere detector array. The ground band has been extended up to $I^{\pi }={22}^{+}$, and side bands are extended with $\Delta I=2$ stretched transitions and $\Delta I=1$ crossing transitions. The observed level scheme is interpreted in terms of possible octupole correlations. Two sets of interwined positive- and negative- parity bands with the simplex quantum numbers $s=\pm 1$ are suggested. The results of $B(E1)/B(E2)$ branching ratios indicate that the octupole correlations in ${}^{148}\mathrm{Ce}$ are strong.

• Received 21 November 2005

DOI:https://doi.org/10.1103/PhysRevC.73.054316