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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The authors wish to express their gratitutde to Prof. H. Verheul, Prof. A.H. Wapstra and Dr. P.F.A. Goudsmit for their interest in this work. One of the authors (L.K.P.) would like to express his appreciation for thr hospitality extended to him for his stay at the Vrije Universiteit.
This work is part of the research program of the Institute for Nuclear Physics Research (IKO), made possible by financial support from the Foundation for Fundamental Research (FOM) and the Netherlands Organization for the Advancement of Pure Research (ZWO).
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de Boer, F.W.N., Peker, L.K., Koldewijn, P. et al. Crossing of negative parity bands in even-even nuclei around A≈150. Z Physik A 284, 267–270 (1978). https://doi.org/10.1007/BF01406796
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DOI: https://doi.org/10.1007/BF01406796