Proton-neutron mixed-symmetry2ms+and3ms+states in96Ru

Abstract

The one-phonon mixed-symmetry ${2}_{1,\mathrm{ms}}^{+}$ state and two-phonon mixed-symmetry ${3}_{1,\mathrm{ms}}^{+}$ and ${2}_{2,\mathrm{ms}}^{+}$ states have been identified in ${}^{96}\mathrm{Ru}$ based on intensity branching ratios, $E2/M1$ multipole mixing ratios, upper lifetime limits, and a comparison with the experimental data for ${}^{94}\mathrm{Mo}.$ The observables were obtained from Doppler-shift attenuation measurements and $\ensuremath{\gamma}\ensuremath{\gamma}$ angular correlation analyses following the ${}^{95}\mathrm{Mo}{(}^{3}\mathrm{He}{,2n)}^{96}\mathrm{Ru}$ reaction and the ${\ensuremath{\beta}}^{+}$ decay of ${}^{96}\mathrm{Rh}.$ Shell-model calculations performed for ${}^{96}\mathrm{Ru}$ give clear support for the interacting boson model 2 mixed-symmetry assignments of the one-phonon ${2}_{3}^{+}$ state at 2283.8 keV as well as of the two-phonon ${2}_{5}^{+}$ state at 2739.8 keV and ${3}_{2}^{+}$ state at 2897.7 keV.