Observation of the First Excited State in 23
نویسندگان
چکیده
The first excited state in neutron-rich 23 O was observed in a (2p1n) knockout reaction from 26 Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22 O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of further resonances implies a predominantly direct reaction mechanism of the employed three-nucleon-removal reaction which suggests the assignment of the observed resonance to be the 5/2 + hole state.
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