Complex shape effects in nuclear rotational spectra |
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Authors: | N. Minkov S. B. Drenska P. Yotov W. Scheid |
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Affiliation: | 1.Institute for Nuclear Research and Nuclear Energy,Bulgarian Academy of Sciences,Sofia,Bulgaria;2.Institut für theoretische Physik der Justus-Liebig-Universit?t,Giessen,Germany |
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Abstract: | We study the evolution of collectivity in the structure of nuclear rotational bands based on complex quadrupole-octupole shapes. We apply an extended version of a quadrupole-octupole rotation model capable of reproducing both the low-lying states of alternating parity bands interpreted on the basis of octupole vibrations and the higher spin states considered as members of a single octupole rotational band. In such a way, the complicated odd-even staggering effects observed in light actinide nuclei are described successfully. The implemented model analysis suggests a unified mechanism in which the octupole band structure is formed as the result of the transition from an octupole vibration (soft) mode to a rotation of a shape with a stable quadrupole-octupole deformation. |
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