Evidence for octupole softness of the superdeformed shape from band interactions in 193,4Hg

D. M. Cullen*, M. A. Riley, A. Alderson, I. Ali, T. Bengtsson, M. A. Bentley, A. M. Bruce, P. Fallon, P. D. Forsyth, F. Hanna, S. M. Mullins, W. Nazarewicz, R. Poynter, P. Regan, J. W. Roberts, W. Satula, J. F. Sharpey-Schafer, J. Simpson, G. Sletten, P. J. TwinR. Wadsworth, R. Wyss

*Corresponding author for this work

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Three superdeformed (SD) bands have been observed in 194Hg and four (or five?) SD bands in 193Hg using the 150Nd + 48Ca reaction. All bands except for two in 193Hg show a steady increase in dynamical moment of inertia J(2) with rotational frequency. The two exceptional bands form a classical pair of strongly interacting bands. It is suggested that the strong interaction between the bands is caused by a softness to octupole deformation. Evidence is found for the existence of dipole transitions connecting bands of opposite signature in 193Hg. The strengths of these transitions suggest that they are probably E1 supporting the importance of the role of octupole vibrations. These data suggest the wider importance of octupole softness in enhancing E1 transitions in the SD feeding and decay mechanisms. The spectroscopy of the observed SD bands in 193,4Hg are discussed in detail and attention is drawn to the "identical" energies of γ-rays in these isotopes with those in lighter isotopes. The similarities in bands relate to the neutron sub-shell closure for SD nuclei at N=112.

Original languageEnglish
Pages (from-to)c105-c113
JournalNuclear Physics, Section A
Issue numberC
Publication statusPublished - Dec 1990

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