The nucleus 160 Er, with the structural parameter R 4/2 = E(4 + 1)/E(2 + 1) = 3.10, falls on the transition path between the critical point of the vibrator-rotor shape phase transition and the rigid rotor limit, thus serving as a critical test of the CBS rotor model, which describes this transition region. Medium-spin states of 160 Er have been populated via the reaction 159 Tb(6 Li,5n) and new levels have been identified and interpreted as the even-spin members of the γ band and members of the β vibrational band. Level energies and branching ratios are compared to the CBS rotor model predictions.

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