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Observation of a two-neutron cascade from a resonance in O24

C. R. Hoffman, T. Baumann, J. Brown, P. A. DeYoung, J. E. Finck, N. Frank, J. D. Hinnefeld, S. Mosby, W. A. Peters, W. F. Rogers, A. Schiller, J. Snyder, A. Spyrou, S. L. Tabor, and M. Thoennessen
Phys. Rev. C 83, 031303(R) – Published 25 March 2011

Abstract

A new resonance having a relative decay energy of ~0.6 MeV has been observed above the two-neutron separation energy in O24 at an excitation energy of ~7.5 MeV. The new level was found to directly feed the first excited state in O23, an E=0.045(2)-MeV resonance, through the measurement of neutron-neutron correlations. Energy level comparisons with O23 suggest that this new level in O24 is dominated by an unpaired neutron in the ν0d3/2 single-particle orbital coupled to a single hole in the ν0d5/2 single-particle orbital. Establishment of this two-neutron discrimination technique provides a means for investigating high-lying excited states in neutron-rich nuclei.

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  • Received 28 October 2010

DOI:https://doi.org/10.1103/PhysRevC.83.031303

©2011 American Physical Society

Authors & Affiliations

C. R. Hoffman1,2,*, T. Baumann3, J. Brown4, P. A. DeYoung5, J. E. Finck6, N. Frank3,7,†, J. D. Hinnefeld8, S. Mosby3,7,9, W. A. Peters3,7,‡, W. F. Rogers9, A. Schiller3,§, J. Snyder3,7, A. Spyrou3,7, S. L. Tabor2, and M. Thoennessen3,7

  • 1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 3National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, 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 and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 8Department of Physics and Astronomy, Indiana University at South Bend, South Bend, Indiana 46634, USA
  • 9Department of Physics, Westmont College, Santa Barbara, California 93108, USA

  • *calem.hoffman@gmail.com
  • Present address: Physics Department, Augustana College, Rock Island, Illinois 61201, USA.
  • Present address: Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA.
  • §Present address: Department of Physics, and Astronomy, Ohio University, Athens, Ohio 45701, USA.

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Issue

Vol. 83, Iss. 3 — March 2011

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