IBM-1 description of the fission products ${}^{108,110,112}$Ru

Abstract

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.

arXiv comment22 pages, 8 figures

References in corpus (2)

• Soft triaxial roto-vibrational motion in the vicinity of $\gamma =\pi /6$
• Solution of the Bohr hamiltonian for soft triaxial nuclei

Cited by in corpus (5)

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• Triaxial projected shell model study of $\gamma$-bands in atomic nuclei