In-beam study of excited states in 80 Br

Excited states of the doubly-odd nucleus80Br have been studied via the reactions80Se(p, n),80Se(d,2n) and78Se(α, pn) using in-beamγ-ray spectroscopy. A positiveparity level sequence built on aIπ=5+ state at 331.04 keV has been found up to spin (10). For this 5+ level de-exciting to the known 5− isomeric state and for the 6+ level at 357.22 keV half-lives of 0.7 and 0.4 ns, respectively, have been determined. Negativeparity states have been observed up to spin (6). For the positive-parity level sequence the configuration (πg9/2,vg9/2) and collective excitations are proposed. Some of the negative-parity states are tentatively interpreted as arising from the configurations (πp3/2,vg9/2) and (πp3/2, (vg9/2) 7 2/3 ).