Interacting boson model plus broken-pair description of high-spin dipole bands

The Interacting Boson Model with broken-pairs has been extended to include mixed proton-neutron configurations in the fermion model space. The extended version of the model has been used to describe high-spin bands in the transitional nucleus 136 Nd. Model calculations reproduce ten bands of positive and negative parity states, including the two dipole high-spin structures based on the (�h11/2) 2 (�h11/2) 2 configuration.