Negative parity bands in²³⁸U

We describe the low-lying negative parity states of 238U in terms of a Pb–Ne cluster model. The Pb core is in an excited 3− state and the relative orbital motion has angular momentum values L = 0, 2, 4, .... The two bodies interact through central and second rank tensor potentials, leading to four bands loosely labelled by the rotational model notation of Kπ = 0−, 1−, 2−, 3−. However, the coupling between core and cluster is of intermediate strength, leading to an irregular pattern of energy differences, in particular inverted doublets in the Kπ = 1− band. Remarkably, the main features of the predicted spectrum are borne out by experiment.

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