The structure of ${}_{}{}^{98}{}_{}{}^{}\mathrm{Ru}$ was studied using the ${}_{}{}^{97}{}_{}{}^{}\mathrm{Mo}$${(}^3$He,2nγ${)\mathrm{}}^{98}$Ru reaction, which populated many non-yrast states that had not been observed previously. The experiments included γ-ray excitation functions, angular distributions, linear polarizations, and γ-γ coincidences. It is shown that low-lying non-yrast states in this transitional nucleus can be described in a rotational framework without using a vibrational degree of freedom. The interpretation used a model with two quasiparticles coupled to a symmetric rotor. A surface-delta residual interaction was included.

• Received 8 September 1987

DOI:https://doi.org/10.1103/PhysRevC.37.605