Spin-orbital vibrations of spherical nuclei

One-phonon O+ states generated by the spin-orbital interaction in a particle-hole channel are studied on examples of a number of isotopes of Zr and Mo. The structure of states is calculated with account of pairing interaction in the particle-hole channel. The wave functions of excited states, relative spectroscopic factors for the (p, t) and (t, p) reactions and probabilities of the EO transitions are calculated. In most cases the states are found to be collective, the first O+ state appears beneath the energy gap, the structure of the states differs essentially from the structure of the pairing vibrations