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Negative parity bands in even–even isotopes of Ra, Th, U and Pu

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There are negative parity bands, conveniently labelled K = 0-, 1- and 2-, with very similar patterns of excitation energies in many of the even–even isotopes of Ra, Th, U and Pu. Furthermore, the 3- states in many of these bands decay to the 0+ ground state with reduced B(E3) transition strengths closely similar to one another and comparable to the strengths found in the isotopes of Pb. We propose a Pb core plus exotic cluster model explanation of these observations. Such a treatment accounts for the persistence of these features across many isotopes and gives a good description of the excitation energies and E3 rates for all of them. The wavefunctions generated are intermediate between the weak and strong coupling limits. They suggest that the K = 1- bands consist of doublets, possibly inverted, and thereby give rise to a novel proposal for a unification of some of the disparate band structures seen in 238U.

Document Type: Research Article


Publication date: August 1, 2008


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