Abstract
A bandlike structure, based on the $\ensuremath{\pi}{h}_{11/2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}$ configuration, has been identified for the first time in ${}^{134}$Cs in a gamma-ray spectroscopic study using fusion evaporation reactions. The nature of this band in ${}^{134}$Cs has been found to be distinctly different than the nearly degenerate doublet rotational band structures, observed in the lighter Cs isotopes for the same configuration. Both the total Routhian surface and the tilted axis cranking calculations were performed to understand the experimental observations. The present results suggest that the $N=77$ defines the border of the deformed structure in the $A\ensuremath{\sim}130$ region while approaching $N=82$.
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