Survey of Collective and Single-Particle Features in the Yrast Domain of the A ∼ 150 Nuclei

Collective properties at low and high spin for nuclei with Z ≳ 64 and N ≳ 82 are calculated on the basis of deformed single-particle potentials. The calculations are confronted with the available experimental data like low-lying octupole bands, rotational bands of transitional nuclei with N ≳ 90 and evidence for collectivity in high-spin single-particle spectra. In the latter collective triaxiality and collective rotation perpendicular to the aligned spin are investigated by cranking and RPA. Predicted regimes of different shapes and shape transitions at high spins are presented. In a gamma cascade calculation, it is shown how the calculated regimes for 152Dy are consistent with the measured inclusive spectrum.

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