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No abstract available

[en] Using the several criteria for the spin assignment of a rotational band based on very general argument, the spin of the lowest level observed in the yrast SD band ¹⁵²Dy(1) is assigned to be I₀ = 26(E_γ(I₀ + 2→I₀) = 602.4 keV), and it is demonstrated that spin assignments of I₀ ≤ 25 as well as I₀≥27 are in contradiction with these criteria

No abstract available

[en] Recent experiments using the Eurogam array have revealed a wealth of new information regarding the properties of superdeformed bands in the mass 150 region. These new results include the observation of new bands and also superdeformed band interactions. A very large data set has been obtained on ¹⁵²Dy in order to search for transitions linking the superdeformed to normal states and to further investigate the entrance channel effect observed in the intensity of superdeformed states populated via different reactions. Analysis of these data is currently in progress and results to date will be reviewed

[en] The influence of band interaction on the spin predictions and the J⁽²⁾ pattern of superdeformed (SD) bands are investigated. To make a reliable spin prediction using the best-fit method, the transitions with significant band mixing should be excluded from the least-squares fitting. Spin predictions for 15 SD bands in the A∼150 region are made. In particular, the spin of the lowest level of the first discovered high-spin SD band ¹⁵² Dy(1) is predicted to be I₀=26. A two-band mixing model is used to describe the irregular behaviour of J⁽²⁾ with angular momentum. Two types of J⁽²⁾ patterns are discussed. For the band-crossing case, the J⁽²⁾ pattern in the band-crossing region is of a V (or inverse-V) type, which has been observed in both the A∼190 and 150 regions. For the band-mixing case characterized by a relatively weak band interaction, the J⁽²⁾ pattern in the band-mixing region is of a W (or inverse-W) type, which was observed only in some SD bands in the A∼150 region. (author)

[en] Positive parity states at normal deformation and superdeformation (SD) are calculated in medium and heavy nuclei as eigenstates of the Bohr-like Hamiltonian deduced from the Griffin-Hill-Wheeler equation treated in the Gaussian Overlap Approximation

[en] Microscopic calculations overestimate the amount of angular momentum carried by the superdeformed rotational band in ¹⁵²Dy. This discrepancy between experiment and theory can be accounted for by the dynamic pairing correlations. Reasons for the particular importance of these correlations in fast rotating and strongly deformed nuclei are discussed. (orig.)

[en] A detailed γ-ray study of ¹⁵²Dy emitted in decay of the superdeformed band has been performed using the ¹²²Sn(³⁵CL,P4n) reaction at low bombarding energy. Several γ-rays de-exciting non-yrast states have been identified, among them transitions previously observed in coincidence with this superdeformed band. We can also weakly detect the lowest two members of the superdeformed cascade, but the data are not quite good enough to make a firm connection to them. (author). 6 refs, 3 figs, 1 tab