Crossing of negative parity bands in even-even nuclei around A≈150 |
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Authors: | F. W. N. de Boer L. K. Peker P. Koldewijn J. Konijn |
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Affiliation: | 1. Natuurkundig Laboratorium van de Vrije Universiteit, Amsterdam, The Netherlands 2. Instituut voor Kernphysisch Onderzoek, Amsterdam, The Netherlands
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Abstract: | Level energies of negative parity yrast bands (NPB) have been studied with a recently proposed, sensitive method. The irregular behaviour of the NPB's in theN=88 nuclei around spin 9–11 and the smooth behaviour in156Dy (up toI=13) and in238U (up to I=19) support calculations by Vogel, where NPB's are described as aligned octupole bands up to a critical spin where intersection with two-quasiparticle bands takes place. Considering the NPB levels (I≦13) in156Dy as members of an aligned octupole band, we obtain a remarkably good reproduction of their decay properties and energies using the VMI model. |
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