Levels inBa140populated in the decay of 64-secCs140

The $\gamma$-ray decay of 64-sec fission-product ${}_{}{}^{140}{}_{}{}^{}\mathrm{Cs}$ has been studied using the TRISTAN on-line isotope-separator system. Ge(Li) detector singles and Ge(Li)-Ge(Li) coincidences were performed. 154 $\gamma$-ray transitions were assigned to a level scheme for ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ba}$ with 30 definite and 13 tentative excited levels. Tentative spin and parity assignments were made for some of these levels. The relationship between ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ba}$ and the other even Ba isotopes is discussed, and an interesting similarity with ${}_{}{}^{134}{}_{}{}^{}\mathrm{Ba}$ is noted.