Fine structure in 192Po α-decay and shape coexistence in 188Pb

Excited Jπ=0+ states in 188Pb populated in the α-decay of 192Po have been identified through α-particle/conversion electron coincidences. α-particle energies and branching ratios have been measured, and hindrance factors deduced. The level scheme has been fitted using a configuration mixing calculation, providing estimates of the mixing matrix elements, mixing amplitudes and the energies of unperturbed and unobserved levels.