Soft-rotator Model Analysis of Collective Band Structures of Even-even Actinide Nuclei
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Positive-parity collective band structures of low-lying levels in even-even actinide nuclei were analyzed based on an extension of the Davydov-Chaban soft rotator model, which accounts for the rotation and β- and γ-vibrations of even-even nuclei with non-axial quadrupole deformation. The parameters to reproduce the 4-bands, i.e., the ground-state rotational band, the Kr_ ?? _2 band, and the n<SUB>β</SUB>=1 and n<SUB>γ</SUB>=1 bands, were obtained, and their systematic trends were deduced. Based on this result the unassigned band having a sequence of 0<SUP>+</SUP>, 2<SUP>+</SUP>, 4<SUP>+</SUP>, …, which is observed in many actinide nuclei, was assigned likely to be the n<SUB>β</SUB>=1 band. The systematic trends of the parameters found in this work could be a guide to estimate the collective band structure of nuclei for which such data are poorly known. The correct assignment of collective levels was found to be important for the calculation of neutron inelastic scattering cross sections.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 34(5), 490-497, 1997-05-25
Atomic Energy Society of Japan