Selective population and neutron decay of the first excited state of semi-magic O-23

Details Selective population and neutron decay of the first excited state of semi-magic O-23 Selective population and neutron decay of the first excited state of semi-magic O-23

2006-12-21

arxiv.org/abs/nucl-ex/0612024v1

Phys.Rev.Lett.99:112501,2007

Physics

Nuclear Physics

Nuclear Experiment

4 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.99.072503

We have observed an excited state in the neutron-rich semi-magic nucleus O-23 for the first time. No such states have been found in previous searches using gamma-ray spectroscopy. The observation of a resonance in n-fragment coincidence measurements confirms the speculation in the literature that the lowest excited state is neutron unbound and establishes positive evidence for a 2.8(1) MeV excitation energy of the first excited state in O-23. The non-observation of a predicted second excited state is explained assuming selectivity of inner-shell knockout reactions.

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