New high-spin isomer and quasiparticle-vibration coupling in Ir-187

The high-spin structure of the Z=77 nucleus 187Ir has been studied using the fusion-evaporation reaction 186W(7Li6n) at a beam energy of 59 MeV. The excitation scheme of this nucleus has been extended by more than 110 new states, including extensions of all previously established rotational bands. The band crossing region of the h9/2 negative-parity yrast band has been revised and new intrinsic high-K states have been identified. In particular, a 29/2- isomeric state [T1/2=1.8(5)μs] at an excitation energy of 2487 keV has been observed for the first time, and on top of it, a rich level scheme reaching up to spin (59/2-) and excitation energies around 7 MeV has been established.