Nuclear structure of neutron-rich 78As

Excited states in the neutron-rich doubly-odd nucleus 78As have been identified for the first time by proton-γ and γ-γ coincidence measurements via the 76Ge(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 (π9/2 x νg9/2) intruder two-quasiparticle configuration with some collective components in the 9(+) and (10+) states. (orig.)