Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-03-23
Phys.Rev. C73 (2006) 044315
Physics
Nuclear Physics
Nuclear Theory
25 pages, 13 figures. Accepted in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.73.044315
A collective Hamiltonian for the rotation-vibration motion of nuclei is considered, in which the axial quadrupole and octupole degrees of freedom are coupled through the centrifugal interaction. The potential of the system depends on the two deformation variables $\beta_2$ and $\beta_3$. The system is considered to oscillate between positive and negative $\beta_3$-values, by rounding an infinite potential core in the $(\beta_2,\beta_3)$-plane with $\beta_2>0$. By assuming a coherent contribution of the quadrupole and octupole oscillation modes in the collective motion, the energy spectrum is derived in an explicit analytic form, providing specific parity shift effects. On this basis several possible ways in the evolution of quadrupole-octupole collectivity are outlined. A particular application of the model to the energy levels and electric transition probabilities in alternating parity spectra of the nuclei $^{150}$Nd, $^{152}$Sm, $^{154}$Gd and $^{156}$Dy is presented.
Bonatsos Dennis
Drenska Svetla
Lenis D.
Minkov Nikolay
Petrellis D.
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