First two energy levels in 15F

W. A. Peters, T. Baumann, D. Bazin, B. A. Brown, R. R. C. Clement, N. Frank, P. Heckman, B. A. Luther, F. Nunes, J. Seitz, A. Stolz, M. Thoennessen, and E. Tryggestad
Phys. Rev. C 68, 034607 – Published 9 September 2003
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Abstract

The ground state and first excited state of 15F were measured by the method of elastic resonance scattering in inverse kinematics. A secondary beam of 115 MeV/nucleon 14O was slowed down to 8 MeV/nucleon and energy bunched before stopping in a C2H4 target. The 15F excitation energy spectrum was extracted from elastically scattered protons at 0°. The 1/2+ ground state resonance of 15F was determined to be unbound with respect to single-proton emission by 1.51±0.11MeV, corresponding to a mass excess of 16.81±0.11MeV. The 5/2+ first excited state resonance is unbound by 2.853±0.045MeV leading to an excitation energy of 1.34±0.15MeV. A comparison with systematics of single-nucleon separation energies and theoretical models suggests that 11N should be unbound by about 1.5±0.15MeV.

  • Received 9 June 2003

DOI:https://doi.org/10.1103/PhysRevC.68.034607

©2003 American Physical Society

Authors & Affiliations

W. A. Peters1,2, T. Baumann1, D. Bazin1, B. A. Brown1,2, R. R. C. Clement1, N. Frank1,2, P. Heckman1,2, B. A. Luther1,*, F. Nunes1,2, J. Seitz1,2, A. Stolz1, M. Thoennessen1,2, and E. Tryggestad1,†

  • 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

  • *On leave from Department of Physics, Concordia College, Moorhead, MN 56562.
  • Present address: Institut de Physique Nucléaire,IN2P3-CNRS, 91406 Orsay Cedex, France

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Vol. 68, Iss. 3 — September 2003

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