The spectrum structure of Ge isotopes was studied in the framework of a microscopic neutron-proton interacting boson model with two quasiparticle states. The approach started from shell model configurations and nucleon-nucleon effective interactions. Bands built upon both neutron and proton (g9/2)2 configurations were considered. In the calculation of Ge isotopes, the single-particle energies for the open shells and strengths of the nucleon-nucleon effective interactions were employed. Fairly good agreement is obtained between ex...
