Abstract
The energies of the positive parity ground state band with Lπ=0+,2+,4+,… and the negative parity octupole band with Lπ=1−,3−,5−,… in normally deformed Thorium (Th) even-even nuclei are described in the framework of the rotational limit of the symplectic interacting vector boson model (IVBM) based on the algebra of Sp(12,R) group. The experimental data best fit to adopt the best model parameters are determined by utilizing a simulated search program in order to achieve minimum root mean square deviation between the experimental and calculated excitation energies. The agreement between experimental and calculated energies is very good. The odd-even ΔL=1 staggering effects between ground and octupole bands are investigating by calculating staggering index depending on the dipole transitions linking the two bands and the quadruple transitions within each band. Also the presence of ΔL=2 energy staggering (commonly called ΔL=4 bifurcation) in ground state band of 232Th has been investigated, by calculating staggering index representing the finite difference approximation to the forth order derivative of the quadruple transition energies at a given spin.
Published Version
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