The general collective model applied to the chains of Pt, Os and W isotopes

Calculated energy spectra, B(E2) branching ratios, absolute B(E2) values and quadrupole moments are compared with experiment. The model shows a transition of the Pt isotopes from the gamma -soft nearly triaxial 78196Pt to gamma -unstable 78190Pt. Two minima appear in the case of 78186Pt, one at the oblate and the other one at the prolate axis. Similar structure is obtained for 76184Os: the character of the potential changes in the Os chain from prolately deformed minimum to gamma -soft nearly triaxial behaviour in the case of 76192Os. The W isotopes continue the properties of the isotopes 78186Pt and 76184Os. The capabilities of the model and the illustrative way of presenting the collective properties by potential energy surfaces are demonstrated.

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