$\gamma$ Vibrational Band in $^{70}$Ge

Excited states in $^{70}$Ge were populated by the $^{55}$Mn($^{18}$O,$p2n$) fusion-evaporation reaction at 50 MeV performed at Florida State University. Prompt $\gamma$-$\gamma$ coincidences were measured with a Compton-suppressed Ge array consisting of three Clover detectors and seven single-crystal detectors. Examination of the resulting coincidence relations and relative intensity measurements led to an enhanced $^{70}$Ge level scheme, including an extension of the proposed $\gamma$ vibrational band by four new states. Interpretation of the $\gamma$ band within the context of the staggering parameter $S(I)$ suggests a $\gamma$-soft structure, similar to other light Ge isotopes. Total Routhian Surface calculations for the ground-state band are consistent with a picture of $\gamma$ softness at low spin.