Low-lying levels of the nucleus ' Ce have been studied by Coulomb excitation with He, ' C, and ' 0 projectiles to determine various B(Elj.) values and the static quadrupole moment Q(21+).Excellent agreement is found between the observed properties and predictions made using the U(5) limit of the proton-neutron interacting boson model. The results strongly support the contention that the 23+, 2.004-MeV level has mixed proton-neutron symmetry.Combining the present measurement for B(E2;0|+ 23+) of 0.070~0.011 e212 with known branching and mixing ratios gives a substantial M1 strength of (0.26~0.05)ttg for the 23+~21+ transition.
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