Abstract
Energy levels in some neutron-deficient doubly even nuclei in the platinum region have been studied following heavy-ion reactions. Information of the ground state rotational (or quasi-rotational) bands in 178, 180, 182Os, 182, 184, 186, 188Pt and 188, 190Hg is presented. The levels suggest that the light platinum nuclei are very soft axially-symmetric rotors, rather different from the well-known γ-unstable or tri-axial heavy osmium nuclei. The energy-level systematics of this region are compared with those of the samarium region, and it is concluded that the two regions are basically similar, with the well-known 88–90 neutron discontinuity reasonably well duplicated between neutron-deficient osmium and platinum nuclei (proton number 76–78).
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