Abstract
We study low-energy shape oscillations of negative parity in the first and second (isomeric) minima in actinides. As a main tool, we use the phenomenological Woods-Saxon potential with a variety of shape deformations. This allows including a mixing of various multipolarities when considering oscillations with a fixed quantum number. The phonon energies are determined either from the collective Hamiltonian with the microscopic-macroscopic energy and cranking mass parameters, or from its simplified version with the constant-mass parameters. The results for in the first minima are in reasonable agreement with experimental data, which include predicted transitions; the energies are systematically overestimated. In the second minimum, as compared to the data for and , our calculated energies are overestimated, while the energies are three or more times too large. This signals either a noncollective character of the experimentally assigned states or a serious flaw of the model in the second minimum. More data on the , collective states in the second minima of other nuclei are necessary to resolve this issue.
- Received 14 September 2010
DOI:https://doi.org/10.1103/PhysRevC.82.054303
©2010 American Physical Society