The level structures of the N=50 Br85 and Rb87 isotopes have been studied in the fission of the compound system formed in three different heavy-ion-induced reactions. In Rb87 many states above the previously known 9/2+ isomer have been established. The coupling of the odd proton occupying the g9/2 orbital to the yrast states in the Kr86 core can account for the first excited states above the isomer in Rb87. A comparison with the first excited states above the 9/2+ state in Kr85 and Y89 reveals similarities in the coupling. At higher excitations similar behavior to Y89 is observed, indicating a possible presence of neutron-core excitations. In Br85 several states up to ~5 MeV excitation energy have been established. Two states at ~2 MeV excitation energy are candidates for the 9/2+ state originating from the odd proton occupying the g9/2 orbital. The experimental results for both isotopes are compared with predictions of the shell model.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics