Low-energy shape oscillations of negative parity in the main and shape-isomeric minima in actinides

M. Kowal and J. Skalski
Phys. Rev. C 82, 054303 – Published 4 November 2010

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 K 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 Kπ=0,1 in the first minima are in reasonable agreement with experimental data, which include predicted E1 transitions; the Kπ=2 energies are systematically overestimated. In the second minimum, as compared to the data for Pu240 and U236, our calculated K=1,2 energies are overestimated, while the K=0 energies are three or more times too large. This signals either a noncollective character of the experimentally assigned K=0 states or a serious flaw of the model in the second minimum. More data on the K=0, Iπ=1 collective states in the second minima of other nuclei are necessary to resolve this issue.

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  • Received 14 September 2010

DOI:https://doi.org/10.1103/PhysRevC.82.054303

©2010 American Physical Society

Authors & Affiliations

M. Kowal* and J. Skalski

  • Soltan Institute for Nuclear Studies, Hoża 69, PL-00-681 Warsaw, Poland

  • *m.kowal@fuw.edu.pl

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Issue

Vol. 82, Iss. 5 — November 2010

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