Candidates for the two-phonon quadrupole-octupole $1^{-}$ state and the two-phonon mixed-symmetry $1_{\mathrm{ms}}^{+}$ state have been identified in the $N=52$ isotope ${}^{96}\mathrm{Ru}$ using the nuclear resonance fluorescence technique at the bremsstrahlung facility of the Stuttgart Dynamitron accelerator. Detailed information on energies, spins, branching ratios, and transition strengths of four new dipole excitations in ${}^{96}\mathrm{Ru}$ have been obtained. The observed dipole excitations are nearly at the same energies as in ${}^{94}\mathrm{Mo}$, and the transition probabilities are comparable to those for the decay of the $(2_1^{+}\otimes 3_1^{-})1^{-}$ and the $(2_1^{+}\otimes 2_{\mathrm{ms}}^{+})1_{\mathrm{ms}}^{+}$ states in ${}^{94}\mathrm{Mo}$.

• Received 23 September 2005

DOI:https://doi.org/10.1103/PhysRevC.72.064323