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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.
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Contributor : Michel Lion <>
Submitted on : Tuesday, June 12, 2007 - 3:57:35 PM
Last modification on : Thursday, August 22, 2019 - 2:44:01 PM
Long-term archiving on: : Thursday, April 8, 2010 - 7:42:02 PM

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I. Stefanescu, A. Gelberg, J. Jolie, P. van Isacker, P. von Brentano, et al.. IBM-1 description of the fission products $^{108,110,112}$Ru. Nuclear Physics A, Elsevier, 2007, 789, pp.125-141. ⟨10.1016/j.nuclphysa.2007.03.007⟩. ⟨in2p3-00153897⟩

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