Low-lying states of ${}_{}{}^{200}{}_{}{}^{}\mathrm{Pt}$ have been studied by the ${}_{}{}^{198}{}_{}{}^{}\mathrm{Pt}$(t,pγ) and (t,${\mathrm{pe}}^{\mathrm{-}}$) reactions with 16-MeV tritons. From detailed p-γ, p-${\mathrm{e}}^{\mathrm{-}}$, and p-γ-γ coincidence measurements, a level scheme that includes 16 excited states has been established. A 14.3-ns isomer is observed and is believed to correspond to the $7^{\mathrm{-}}$ isomers prevalent in the lighter even-mass platinum nuclei. Limited comparisons are made with the U(5) and O(6) symmetries of the interacting boson model.

• Received 19 January 1988

DOI:https://doi.org/10.1103/PhysRevC.37.1889