MICROSCOPIC ANALYSIS OF WOBBLING EXCITATIONS IN ¹⁵⁶Dy AND ¹⁶²Yb
Nazmitdinov R.G., Kvasil J.

Received: March 13, 2007

PACS: 21.10.Re, 21.60.Jz, 27.70.+q

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In the cranked Nilsson-plus-random-phase approximation, we study low-lying quadrupole excitations of positive parity and negative signature in ¹⁵⁶Dy and ¹⁶²Yb at high spins. Special attention is paid to a consistent description of wobbling excitations and their identification among excited states. A good agreement between the available experimental data and the results of calculations is obtained. We find that the lowest odd-spin γ-vibrational states in ¹⁵⁶Dy transform into the wobbling excitations after the backbending associated with the transition from axially symmetric shape to nonaxial shape. Similar results are predicted for ¹⁶²Yb. The analysis of electromagnetic transitions uniquely determines the sign of γ-deformation in both nuclei after the transition point.