An IBM description of76Se and neighbouring Se-isotopes

The level structure of 76Se is discussed within the framework of Interacting Boson Models. The calculated energy levels, transition probabilities, mixing ratios, ${Q_{2_1^ + }}$ and ${g_{2_1^ + }}$ are compared with experimental data. Mixed-symmetry states are investigated in the isotopes 72Se, 74Se, 76Se, 78Se and 80Se. Two mixed symmetry states with spin 1+ and 3+ are proposed for 76Se, and also six other 1+ and 2+ levels in the neighbouring selenium isotopes.