Abstract
Excitation energies, branching ratios and E2/M1 mixing ratios of the negative-parity states in 125,127Xe and 125,127,129Cs have been calculated by using the proton-neutron Interacting Boson Fermion Model (IBFM2). A good agreement with the experiment has been obtained. The sensitivity of the calculated observables to changes in model parameters is discussed and the results are compared with those obtained from the IBFM1. We examine a symmetry of the Hamiltonian with respect to the change of sign of the parameters χ π , χ ν and Г. The different behaviours of the odd Xe and Cs isotopes arise from the different position of the proton and neutron Fermi levels. In particular the exchange term of the Hamiltonian in 125,127,129Cs can be neglected.
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