An investigation of the ${\beta }^{\mathrm{-}}$ decay of 0.59 s ${}_{}{}^{145}{}_{}{}^{}\mathrm{Cs}$ into levels of ${}_{}{}^{145}{}_{}{}^{}\mathrm{Ba}$ was undertaken to search for evidence of intrinsic reflection asymmetry in light rare-earth nuclei. $E_{\gamma }$, $I_{\gamma }$, γ-γ coincidence, angular correlation coefficients, and internal conversion coefficients were measured. The level scheme for ${}_{}{}^{145}{}_{}{}^{}\mathrm{Ba}$ up to 1.3 MeV has been constructed. The proposed spin and parity assignments are based upon the measured transition multipolarities and the γ?(hyγ angular correlation coefficients. The levels at 112, 175, 277, and 416 keV may be members of a decoupled K${=1/2\mathrm{}}^{\mathrm{-}}$ band with a decoupling parameter of -2 and a rotational parameter of 20 keV. The octupole deformed rotational structure which is observed in the light odd-A actinides is not readily identified in ${}_{}{}^{145}{}_{}{}^{}\mathrm{Ba}$.

• Received 28 April 1986

DOI:https://doi.org/10.1103/PhysRevC.34.1012