Coulomb Excitation ofRu99andRu101

The gamma-ray spectra resulting from Coulomb excitation of ${\mathrm{Ru}}^{99}$ and ${\mathrm{Ru}}^{101}$ by 4-7-MeV $\alpha$ particles are reported. Gamma-ray spectra were investigated using both Ge(Li) detectors and NaI(Tl) detectors. More than 14 transitions in ${\mathrm{Ru}}^{99}$ and 21 transitions in ${\mathrm{Ru}}^{101}$ were observed. $B\left(E2\mathrm{}\right)\mathrm{}$ values are presented for 7 states in ${\mathrm{Ru}}^{99}$ and 10 states in ${\mathrm{Ru}}^{101}$. In addition, transition speeds are presented for several $M1\mathrm{}$ and $E2\mathrm{}$ transitions between excited states of these nuclei. The level schemes constructed for both nuclei are essentially in agreement with previous studies of radioactive decay. Many of the $E2\mathrm{}$ transitions in both nuclei are very much enhanced, indicative of the collective character of the states. The transition speeds are compared with various nuclear-model predictions.