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Mass separated sources of 227 Pa (separated as [Formula: see text] ions) were used to study the level structure of 223Ac following alpha decay. The levels in 223 Ac are interpreted as K=5/2± and K=3/2± parity doublet bands which occur naturally in reflection asymmetric models and the multiphonon octupole model. The anomalous structure of the K=3/2− band is explained in terms of Coriolis coupling. The low lying parity doublet bands in 223 Ac , 225 Ac , and 227 Ac are compared and contrasted.