Abstract
Using a selective fluorination method, mass-separated sources of 228Pa (separated as PaF4+ ions) were used to study the level structure of 224Ac following 2% alpha decay. The levels in 224Ac are interpreted as K=0+or- and K=3+or- parity doublet bands which are explained naturally in reflection asymmetric models. The average energy splittings between the parity doublet bands are 12.7 keV for the K=0+or- bands and 7.3 keV for the K=3+or- bands. These very small splittings are expected because of the additional polarization effects of the two odd particles in 224Ac. It is shown theoretically that the Newby shifts in all odd-odd reflection asymmetric nuclei with K=0+or- bands must have the same absolute magnitude but opposite sign in the strong coupling limit. The experimental Newby shifts in 224Ac approach this theoretical expectation.
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