In order to identify double-gamma vibrational states in well-deformed
regions, we have made a Coulomb excitation experiment for Er-168. We c
ould observe 1235-keV and 962-keV gamma transitions decaying from the
2056-keV 4(+) state. The measured E2 transition probabilities support
the assignment of the 4(+) state as a two-phonon gamma-vibrational sta
te.