ZhETF, Vol. 132,
p. 1100 (November 2007)
(English translation - JETP,
Vol. 105, No. 5,
available online at www.springer.com
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
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.