Interacting boson fermion model description for the levels of 71Ge39 populated in the beta decay of 65.30-h 71As

We have studied the level properties of the N=39 nucleus ^71Ge by gamma-ray spectroscopy following the beta decay of ^71As, for which we measure a half-life of 65.30±0.07 h. When we calculated the level structure of ^71Ge within the framework of the interacting boson fermion model, we found good agreement with the experimentally determined level properties. Some evidence was found for the occurrence of levels built on the coexisting ^70core intruder state