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Two-neutron sequential decay of O24

M. D. Jones, N. Frank, T. Baumann, J. Brett, J. Bullaro, P. A. DeYoung, J. E. Finck, K. Hammerton, J. Hinnefeld, Z. Kohley, A. N. Kuchera, J. Pereira, A. Rabeh, W. F. Rogers, J. K. Smith, A. Spyrou, S. L. Stephenson, K. Stiefel, M. Tuttle-Timm, R. G. T. Zegers, and M. Thoennessen
Phys. Rev. C 92, 051306(R) – Published 25 November 2015

Abstract

A two-neutron unbound excited state of O24 was populated through a (d,d) reaction at 83.4 MeV/nucleon. A state at E=715±110(stat)±45(sys)keV with a width of Γ<2 MeV was observed above the two-neutron separation energy placing it at 7.65±0.2MeV with respect to the ground state. Three-body correlations for the decay of O24O22+2n show clear evidence of a sequential decay through an intermediate state in O23. Neither a di-neutron nor phase-space model for the three-body breakup were able to describe these correlations.

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  • Received 1 September 2015

DOI:https://doi.org/10.1103/PhysRevC.92.051306

©2015 American Physical Society

Authors & Affiliations

M. D. Jones1,2,*, N. Frank3, T. Baumann1, J. Brett4, J. Bullaro3, P. A. DeYoung4, J. E. Finck5, K. Hammerton1,6, J. Hinnefeld7, Z. Kohley1,6, A. N. Kuchera1, J. Pereira1, A. Rabeh3, W. F. Rogers8, J. K. Smith1,2,†, A. Spyrou1,2, S. L. Stephenson9, K. Stiefel1,6, M. Tuttle-Timm3, R. G. T. Zegers1,2,10, and M. Thoennessen1,2

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics and Astronomy, Augustana College, Rock Island, Illinois 61201, USA
  • 4Department of Physics, Hope College, Holland, Michigan 49422-9000, USA
  • 5Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
  • 6Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
  • 7Deparment of Physics and Astronomy, Indiana University South Bend, South Bend, Indiana 46634-7111, USA
  • 8Deparment of Physics, Westmont College, Santa Barbara, California 93108, USA
  • 9Department of Physics, Gettysburg College, Gettysburg, Pennsylvania 17325, USA
  • 10Joint Institute for Nuclear Astrophysics – Center for the Evolution of the Elements, Michigan State University, East Lansing, Michigan 48824, USA

  • *jonesm@nscl.msu.edu
  • Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 Canada.

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Vol. 92, Iss. 5 — November 2015

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