arXiv:0706.1756·v1·Nuclear Theory
IBM-1 description of the fission products Ru
I. Stefanescu (K.U. Leuven, Nipne) · A. Gelberg (Koln Univ.) · J. Jolie (Koln Univ.) · P. Van Isacker (GANIL) · P. Von Brentano (Koln Univ.) · Y.X. Luo (Vanderbilt Univ., LBNL) · S.J. Zhu (Vanderbilt Univ., Tsinghua Univ.) · J.O. Rasmussen (LBNL) · J.H. Hamilton (Vanderbilt Univ.) · A.V. Ramayya (Vanderbilt Univ.) · X.L. Che (Tsinghua Univ.)
Abstract
IBM-1} calculations for the fission products 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) (-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 (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- bands of 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.
Comments: 22 pages, 8 figures