Investigation of sup(196,198)Pt and sup(202,204)Hg with the (d,pnγ) reaction

Gamma-ray and conversion electron spectra were measured in the reaction of 25 MeV deuterons on 174Yb,sup(196,198)Pt,sup(202,204)Hg, and 232Th. The (d,pxn) deuteron break-up reactions were studied by the measurement of pγ- and γγ-coincidences. Levels with spins up to approximately 10 (h/2π) are observed in the (d,pn) reactions, with a strong preference of the population of yrast states. In the Pt and Hg nuclei the ground bands are seen up to the 6+ states and in sup(196,198)Pt the semi-decoupled 5-, 7-, and 9- yrast levels are populated most strongly. In sup(202,204)Hg we observe fairly strongly new levels with tentative assignments of 5- and 7-. In addition a number of previously unknown levels are identified in the Pt and Hg nuclei, for which no spin-parity assignments could be obtained. A discussion of the level structure in terms of the interacting boson model (sup(196,198)Pt) and the shell model (sup(202,204)Hg) is given. (orig.)