SEARCH FOR SHAPE COEXISTENCE IN PB-194

The onset of collective features is expected to occur in the high-spin structure of the light lead isotopes. We have searched for new features in Pb194 using the Dy-162 (S-36, 4n) and the Sm-150 (Ca48, 4n) reactions with projectiles from the Tandem accelerator at Daresbury Laboratory. The level scheme was extended to J almost-equal-to 34 h, a much higher spin than has been observed in other investigations. The highest spin is observed in a band structure consisting of dipole transitions ending at a proposed isomeric state. We find indications of collective band structures among the high-spin states in the spin region J > 16 h. Cranked shell model calculations were performed and the results of these are compared with shell model calculations.