MORE THAN THIRTY BANDS IN RE-177

The level scheme of Re-177 has been extended extensively, with fragmen ts of more than thirty bands, characterised by a given signature, obse rved. Alignments at low frequency in one-quasiparticle bands are inter preted as deformation effects and compared with the predictions of cra nking calculations. The previously assigned one-quasiparticle pi i(13/ 2) band is shown to be a mixture of three-quasiparticle and vibrationa l character. The non-observation of the one-quasiparticle pi i(13/2) b and is explained as being due to crossings of its s-band by competing bands. A number of high-K bands are also reported, including five- and seven-quasiparticle bands. Configuration assignments for these bands are aided by comparing experimental g(K) values with ''effective'' g(K ) values, calculated with a semi-classical expression taking Coriolis mixing into account. The population of the yrast band was observed to oscillate with every four units of spin.