Elsevier

Nuclear Physics A

Volume 567, Issue 1, 10 January 1994, Pages 17-32
Nuclear Physics A

Signature inversion in odd-odd nuclei in the interacting boson-fermion model

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Abstract

The signature inversion in odd-odd nuclei is studied in terms of the interacting boson-fermi-on model (IBFM). Energy levels and electromagnetic matrix elements are calculated in the model in which a proton and a neutron are coupled to the SU(3) (deformed) and the O(6) (γ-unstable) IBM2 cores. When the particles occupy high-j orbits, the signature inversion is caused in the O(6) limit 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. In the case of the SU(3) core, the inversion never occurs when the particles are in high-j orbits. It is seen only around the band head when the fermion orbits have small angular momenta.

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    This work has been supported in part by the Grant-in-Aid for General Scientific Research (No. 01549231) by the Ministry of Education, Science and Culture, and in part by the Japan Society of Promotion of Science. The numerical calculation was performed at the Meson Science Laboratory, the University of Tokyo, and at the Computer Center of RIKEN.

    1

    We are grateful to Prof. I. Hamamoto for her valuable comments.

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