Nuclear structure of neutron-rich78As

Abstract Excited states in the neutron-rich doubly-odd nucleus78As have been identified for the first time by proton-γ and γ-γ coincidence measurements via the76Ge(α, pn) reaction at 32, 36, and 40 MeV beam energy. Four levels have been found to decay with lifetimes in the nanosecond region. The 5(+) to (10+) states are ascribed to the (πg 9/2⊗νg 9/2) intruder two-quasiparticle configuration with some collective components in the 9(+) and (10+) states.