Abstract
The signature inversion in odd-odd nuclei is studied in the interacting boson-fermion model (IBFM). Energy levels and electromagnetic matrix elements are calculated with the SU(3) and the O(6) IBM2 cores. When the particles occupy high- j orbits, the signature inversion occurs with the O(6) core by strong exchange interactions between fermions and the O(6) core. The essential mechanism of the inversion is the mixing of the members of the quasi-γ band into the unfavored states due to the exchange interactions.
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