Excited states and signature inversion in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Cs</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>116</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Excited states have been observed for the first time in the very neutron-deficient, odd-odd nucleus, ${}_{55}^{116}{\mathrm{Cs}}_{61}$. The assignment to $^{116}\mathrm{Cs}$ has been made by the detection of \ensuremath{\gamma} rays in coincidence with evaporated charged particles and with evaporation residues. The observed states form a rotational band which has been assigned to the $\ensuremath{\nu}({h}_{11/2}) \ensuremath{\bigotimes} \ensuremath{\pi}({h}_{11/2})$ configuration. Tentative spin assignments have been made on the basis of systematic comparisons with neighboring cesium isotopes. A low-spin signature inversion is observed in the band at a rotational frequency of about 0.23 MeV$/\ensuremath{\hbar}$. The observed signature inversions in the odd-odd $^{116\ensuremath{-}126}\mathrm{Cs}$ isotopes have been compared with the results of extended total Routhian surface calculations, in which signature inversion arises as a consequence of quadrupole-pairing correlations and triaxial deformation. As previously shown for some of the odd-odd $A\ensuremath{\simeq}120$ isotopes, the calculations reproduce the signature inversions reasonably well.

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