Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-06-12
Nucl.Phys.A789:125-141,2007
Physics
Nuclear Physics
Nuclear Theory
22 pages, 8 figures
Scientific paper
10.1016/j.nuclphysa.2007.03.007
IBM-1} calculations for the fission products $^{108,110,112}$Ru have been carried out. The even-even isotopes of Ru can be described as transitional nuclei situated between the U(5) (spherical vibrator) and SO(6) ($\gamma$-unstable rotor) symmetries of the Interacting Boson Model. At first, a Hamiltonian with only one- and two-body terms has been used. Excitation energies and $B$(E2) ratios of gamma transitions have been calculated. A satisfactory agreement has been obtained, with the exception of the odd-even staggering in the quasi-$\gamma$ bands of $^{110,112}$Ru. The observed pattern is rather similar to the one for a rigid triaxial rotor. A calculation based on a Hamiltonian with three-body terms was able to remove this discrepancy. The relation between the IBM and the triaxial rotor model was also examined.
Brentano von P.
Che X. L.
Gelberg A.
Hamilton Howard J.
Isacker Piet Van
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