DETAILED BAND STRUCTURES IN HG-189 AND HG-190

The level structures of the 189Hg and 190Hg nuclei have been extended considerably from earlier studies by using the Gd-160(S-34, 4n and 5n) reactions in conjunction with an array of twelve Compton suppressed G e detectors. Eight band structures have been delineated in 189Hg and t en in 190Hg. Most bands can be understood within the framework of cran ked shell model calculations assuming an oblate collective shape and s pecific quasiparticle configurations are proposed. There is also some evidence for the onset of triaxiality. In both nuclei level structures which appear to be non-collective in character are interpreted in a b and termination picture.