Eight lifetimes of low-lying states in 198 Pt and 200 Pt were determined using the fast-timing and the recoil distance Doppler shift methods in combination with the Cologne CATHEDRAL spectrometer. Low-lying states in both nuclei were populated in a 198 Pt( 18 O, 18 O) 198 Pt* inelastic scattering and in a 198 Pt( 18 O, 16 O) 200 Pt two-neutron transfer reaction where the beam was provided by the Cologne FN Tandem accelerator. In addition, four new candidates for states and five new transitions could be observed in 198 Pt and placed in the level scheme. The obtained results are discussed in the context of the tungsten-osmium-platinum-mercury region around mass A ≈ 190-200. This region is known to exhibit different nuclear phenomena like a prolate to oblate phase transitions, but also γ -soft nuclei. The results are compared to a mapped interacting boson model with input from the microscopic self-consistent mean-field calculation using a Gogny interaction and to the O (6) limit of the interacting boson model.
Esmaylzadeh et al. (Wed,) studied this question.