Coexistence of “ \alpha + 208Pb ” cluster structures and single-particle excitations in 212 84Po128

Excited states in 212Po have been populated by \( \alpha\) transfer using the 208Pb(18O,14C) reaction at 85MeV beam energy and studied with the EUROBALL IV \( \gamma\) multi-detector array. The level scheme has been extended up to ∼ 3.2 MeV excitation energy from the triple-\( \gamma\) coincidence data. Spin and parity values of most of the observed states have been assigned from the \( \gamma\) angular distributions and \( \gamma\) -\( \gamma\) angular correlations. Several \( \gamma\) -lines with E γ < 1 MeV have been found to be shifted by the Doppler effect, allowing for the measurements of the associated lifetimes by the DSAM method. The values, found in the range [0.1-0.6]ps, lead to very enhanced E1 transitions. All the emitting states, which have non-natural parity values, are discussed in terms of \( \alpha\) - 208Pb structure. They are in the same excitation-energy range as the states issued from shell-model configurations.