Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-03-23
J.Phys. G32 (2006) 497
Physics
Nuclear Physics
Nuclear Theory
16 pages, 7 figures
Scientific paper
10.1088/0954-3899/32/4/008
We propose a collective model formalism which describes the strong parity shift observed in low-lying spectra of nuclei with octupole deformations together with the fine rotational band structure developed at higher angular momenta. The parity effect is obtained by the Schroedinger equation for oscillations of the reflection asymmetric (octupole) shape between two opposite orientations in an angular momentum dependent double-well potential. The rotational structure is obtained by a collective quadrupole-octupole rotation Hamiltonian. The model scheme reproduces the complicated beat staggering patterns observed in the octupole bands of light actinide nuclei. It explains the angular momentum evolution of octupole spectra as the interplay between the octupole shape oscillation (parity shift) mode and the stable quadrupole-octupole rotation mode.
Drenska Svetla
Minkov Nikolay
Scheid Werner
Yotov Plamen
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