Search for two-phonon vibrations in Er168

The low-lying level structure of Er168 has been examined by the (n, n′γ) reaction and all known levels with J<7 and Ex<∼2.0 MeV are observed. The discovery of a level at 1893 keV calls for a reexamination of the completeness of the level scheme assumed previously for this nucleus. No new low-lying candidates for two-phonon γ vibrations are observed. NUCLEAR REACTIONS Er168(n, n′γ), En=1.0-3.5 MeV; measured Eγ, Iγ, σ(E, Eγ, θγ). Searched for two-phonon states.