We study the even-even U and Pu nuclei in the framework of the spdf interacting boson model. Analysis of the systematics of positive and negative parity bands, together with the $E1,$ $E2,$ and $E3$ transitions, suggests that the properties of low-lying states can be understood without the introduction of stable octupole deformation. Double octupole phonon characteristics are also identified in certain low-lying 0⁺ excited states in U and Pu.
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Zamfir et al. (2003) studied this question.
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