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Phys. Rev. Lett. 99, 112501 (2007) [4 pages]

Selective Population and Neutron Decay of an Excited State of 23O

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A. Schiller1,*, N. Frank1,2,3, T. Baumann1, D. Bazin1, B. A. Brown1,2, J. Brown4, P. A. DeYoung5, J. E. Finck6, A. Gade1,2, J. Hinnefeld7, R. Howes8, J.-L. Lecouey1,†, B. Luther3, W. A. Peters1,2, H. Scheit1, M. Thoennessen1,2, and J. A. Tostevin1,2,9
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics, Concordia College, Moorhead, Minnesota 56562, USA
4Department of Physics, Wabash College, Crawfordsville, Indiana 47933, USA
5Department of Physics, Hope College, Holland, Michigan 49423, USA
6Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA
7Department of Physics & Astronomy, Indiana University at South Bend, South Bend, Indiana 46634, USA
8Department of Physics, Marquette University, Milwaukee, Wisconsin 53201, USA
9School of Electronics and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom

Received 21 December 2006; revised 29 June 2007; published 12 September 2007

We have observed a resonance in neutron-fragment coincidence measurements that is presumably the first excited state of 23O at 2.8(1) MeV excitation energy which decays into the ground state of 22O. This interpretation is consistent with theory. The reaction mechanism supports the assignment of the observed state as the 5/2+ hole state. This assignment and the recently observed 3/2+ particle state advance the understanding of 23O.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.112501
DOI:
10.1103/PhysRevLett.99.112501
PACS:
21.10.Pc, 25.60.Je, 27.30.+t, 29.30.Hs

*schiller@nscl.msu.edu

Present address: Laboratoire de Physique Corpusculaire, ENSICAEN, IN2P3, 14050 Caen, Cedex, France.