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The high spin states in $^{195}$Bi has been studied by $\gamma$-rayspectroscopic method using the $^{181}$Ta($^{20}$Ne, 6n) fusion evaporationreaction at 130 MeV. The $\gamma\gamma$ coincidence data were taken using anarray of 8 clover HPGe detectors. The spin and parity assignments of theexcited states have been made from the measured directional correlation fromoriented states (DCO) ratios and integrated polarization asymmetry (IPDCO)ratios. The results show, for the first time, the evidence of a rotational likeband based on a 13/2$^+$ band head in this nucleus, indicating the onset ofdeformation at neutron number $N = 112$ for the Bismuth isotopes. The resultsobtained were found to be consistent with the prediction of the total Routhiansurface calculations using Woods Saxon potential. The same calculations alsopredict a change in shape from oblate to triaxial in $^{195}$Bi at highrotational frequency.

Onset of deformation at $N = 112$ in Bi nuclei