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The nuclear level structure and electromagnetic properties of ~96pt were investigated with y-spectroscopic techniques using multiple Coulomb excitation by 2~ projectiles. Particle-% and particle-y-y coincidences were measured over a wide range of scattering angles. E2-transition moments and static quadrupole moments have been determined by a comparison of experimental scattering-angle dependent y yields with calculated yields in a largely model-independent procedure. The results are compared with different theoretical models: the Asymmetric-Rotor Model, the Generalized Collective Model, and the Interacting Boson Model. The best agreement is obtained with the Generalized Collective Model representing a triaxial nucleus which is soft in the y degree of freedom.

Multiple Coulomb excitation measurements on 198"2~176 have been performed with 5 MeV/amu 2~ projectiles and B(E2)-values are determined for transitions between states up to spin 8 +. In t98Hg a reduction of the B(E2)-value for the yrast transition 8+--* 6 + by a factor of 3 as compared to the rigid rotor prediction is observed, which supports the earlier proposed idea that the ground state band is crossed between the 6 + and 8 + state by a weakly interacting viii, 2 rotation aligned band. In each of the two nuclei, 198Hg and 2~176 a state with a possible U=8 + assignment is observed, which is tentatively interpreted as the 8--member of the ground state band.

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