The static quadrupole moments of the first $2^{+}$ excited states of ${}_{}{}^{96,98,100,102,104}{}_{}{}^{}\mathrm{Ru}$ were measured employing the reorientation effect in Coulomb excitation. For constructive interference via the second $2^{+}$ excited states the determined quadrupole moments are (-0.13±0.09) eb for ${}_{}{}^{96}{}_{}{}^{}\mathrm{Ru}$, (-0.20±0.09) eb for ${}_{}{}^{98}{}_{}{}^{}\mathrm{Ru}$, (-0.43±0.07) eb for ${}_{}{}^{100}{}_{}{}^{}\mathrm{Ru}$, (-0.57±0.07) eb for ${}_{}{}^{102}{}_{}{}^{}\mathrm{Ru}$, and (-0.70±0.08) eb for ${}_{}{}^{104}{}_{}{}^{}\mathrm{Ru}$. These $Q_{2^{+}}$ represent, respectively, 29%, 36%, 67%, 78%, and 84% of the rotational value.

NUCLEAR REACTIONS ${}_{}{}^{96,98,100,102,104}{}_{}{}^{}\mathrm{Ru}(\alpha ,{\alpha }^{\prime })$, $E=8.5\mathrm{}-9.5$ MeV; ${}_{}{}^{96,98,100,102,104}{}_{}{}^{}\mathrm{Ru}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}\text{'}$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},{}_{}{}^{16}{}_{}{}^{}\mathrm{O}_{}^{\prime }{}_{}{}^{}\gamma$), $E=36\mathrm{}-44.8$ MeV; measured $\sigma (E,\theta )$ deduced $Q_{2^{+}}$, $B\left(E\lambda \right)$, $B\left(M1\mathrm{}\right)\mathrm{}$, $J$, $\pi$, $T_{\frac{1}{2}}$. Enriched targets.

• Received 25 September 1979

DOI:https://doi.org/10.1103/PhysRevC.21.588