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High-spin states in '"Pt have been studied with the ' Yb(' 0,4n }'"Pt reaction at 90 MeV using a multidetector array consisting of five Ge detectors and a multiplicity filter of six NaI counters. Rotational bands built on the Nilsson configurations -+[624], -[503], and -' [521] have been identified and interpreted within the framework of'the cranked shell model. Additional band structures built on levels at 3.131 and 3.294 MeV are observed which arise from more complex configurations. Experimental values of B(M1;I~I -1 }/B(E2;I~E -2} ratios have been extracted and compared to predictions of the semiclassical Donau and Frauendorf approach.

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