Wobbling motion in A$\sim$190 region*

The rare phenomenon of nuclear wobbling motion has already been established in the A$\sim$160 and the A$\sim$130 regions. Based on observations of significant triaxiality at low spins in the A$\sim$190 region, we have extended our investigation of wobbling motion to the $^{187}$Au nucleus. The experiment was performed using the Gammasphere array at the Argonne National Laboratory and the $^{174}$Yb($^{19}$F,6n)$^{187}$Au reaction was used to populate the levels of interest. A longitudinal wobbling band has been identified by establishing the characteristic $\Delta$I = 1, E2 nature of the $n_{w+1} \rightarrow n_{w}$ linking transitions. Calculations in the framework of the Particle Rotor Model (PRM) are found to be in good agreement with the experiment. This observation opens a new mass region where nuclear wobbling motion may be found.