Shape coexistence and alignment processes in the light Pt and Au region

High-spin states were populated in 185Au via the 170Yb(19F, 4n)185Au reaction. The shape coexistence of both prolate and oblate band structures was observed. In the prolate bands the two-quasiparticle πh92 and νi132 alignment processes are seen to occur at similar frequencies. The upbend observed in 184Pt is then interpreted as resulting from a double crossing involving both of these processes. Strong evidence is presented for the first identification of a low-lying f72 structure in nuclei below lead.