E0 decays of vibrations in the O(6) limit of the neutron-proton interacting boson model

Expressions are derived for the E0 transition strengths for the symmetric and antisymmetric -vibrational bandhead states to the ground state for O(6)-like nuclei. These E0 transitions are the only ones allowed to the ground state, and we predict them to be of similar magnitude. The isomer shifts for these -vibrational states are also discussed, as well as the isotope shifts for the ground states. We propose the Ba isotopes around A 132 as possible candidates for observing these E0 decays.