Observation of the First Excited State in 23O

Details Observation of the First Excited State in 23O Observation of the First Excited State in 23O

2007-08-20

arxiv.org/abs/0708.2706v1

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 3 figures, Proc. 23rd Winter Workshop on Nuclear Dynamics, February 11-18, 2007

Scientific paper

The first excited state in neutron-rich 23O was observed in a (2p1n) knock-out reaction from 26Ne 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 22O 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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