Nuclear structure of Pt200 from in-beam conversion-electron and -ray spectroscopy

Low-lying states of Pt200 have been studied by the Pt198(t,p) and (t,pe-) reactions with 16-MeV tritons. From detailed p-, p-e-, and p - 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- 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.