Coulomb excitation measurements on ${}^{187}$Os and ${}^{189}$Os have been carried out, using beams of $\alpha$ particles, with the aim of measuring $B\left(E2\mathrm{}\right)\mathrm{}$ values for transitions between states in the low-lying bands. The results are compared with predictions in a pseudospin symmetry scheme and, in the case of ${}^{189}$Os, are used to extract two-state mixing amplitudes for states in near degenerate bands.

• Received 11 April 1997

DOI:https://doi.org/10.1103/PhysRevC.56.1438