IBM-1 description of the fission products 108,110,112Ru
Stefanescu, Irina × Gelberg, A Jolie, J Van Isacker, Pieter von Brentano, P Luo, Y.X. Zhu, S.J. Rasmussen, J.O. Hamilton, J.H. Ramayya, A.V. Che, X.L. #
North Holland Pub. Co.
Nuclear physics A vol:789 pages:125-141
IBM-1 calculations for the fission products 108,110,112Ru 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 110,112Ru. 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.