Decay of mass-separated 187Au (8.4 min) to 187Pt

The decay of 187Au to 187Pt has been studied with mass-separated sources from the UNISOR facility. Multiscaled spectra of γ-rays, X-rays, and conversion electrons, as well as γγt, Xγt, eγt, and eXt coincidences were obtained. The half-life of the 187Au ground state was measured to be 8.4 +- 0.3 min. A decay scheme has been constructed incorporating 88% of the decay intensity assigned to 187Au. The isub(13/2) band in 187Pt is populated through low-spin band members. The levels at 260 and 288 keV are found to de-excite by EO transitions. From a γ-ray-gated K/β+ ratio, the β-decay energy of 8.4 min 187Au is deduced to be Qsub(EC)=3.90 +- 0.15 MeV. The positive-parity states in 187Pt are compared with calculations made using the Nilsson model with a triaxial degree of freedom. The possibility that shape coexistence is present at low energy in 187Pt is discussed. (orig.)