IBM-1 description of the fission products $^{108,110,112}$Ru
- Stefanescu, I.
- Gelberg, A.
- Jolie, J.
- van Isacker, P.
- von Brentano, P.
- Luo, Y.X.
- Zhu, S.J.
- Rasmussen, J.O.
- Hamilton, J.H.
- Ramayya, A.V.
- Che, X.L.
DOIAbstract
22 pages, 8 figuresIBM-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 th...
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