Structure of Ne18 and the breakout from the hot CNO cycle

Phys. Rev. C 54, 1999 – Published 1 October 1996
K. I. Hahn, A. García, E. G. Adelberger, P. V. Magnus, A. D. Bacher, N. Bateman, G. P. A. Berg, J. C. Blackmon, A. E. Champagne, B. Davis, A. J. Howard, J. Liu, B. Lund, Z. Q. Mao, D. M. Markoff, P. D. Parker, M. S. Smith, E. J. Stephenson, K. B. Swartz, S. Utku, R. B. Vogelaar, and K. Yildiz

Abstract

We used the O16(3He,n)18Ne, C12(12C,6He)18Ne, and Ne20(p,t)18Ne reactions to study Ne18 states up to an excitation energy of 10 MeV, with emphasis on levels corresponding to O14(α,p)17F and F17(p)18Ne resonances that could strongly affect these reaction rates in hot stellar environments. Excitation energies, widths, absolute cross sections, and angular distributions were measured. We found previously unidentified states at Ex=6.15±0.01 MeV, 7.12±0.02 MeV, 7.35±0.02 MeV, 7.62±0.02 MeV, 8.30±0.02 MeV, (8.45±0.03 MeV), 8.55±0.03 MeV, 8.94±0.02 MeV, and 9.58±0.02 MeV. We combined level width, cross section, and angular distribution data to infer Jπ values for a number of the new levels as well as for the previously known 5.1-MeV doublet. Using information from our experiments, we recalculated the O14(α,p)17F reaction rate, which constitutes a possible path out of the hot CNO cycle into the rp process and could play an important role in transforming nuclei involved in the hot CNO cycle into heavier nuclei with Z≥10. © 1996 The American Physical Society.

DOI: http://dx.doi.org/10.1103/PhysRevC.54.1999

  • Received 12 January 1996
  • Published in the issue dated October 1996

© 1996 The American Physical Society

Authors & Affiliations

K. I. Hahn, A. García, E. G. Adelberger, P. V. Magnus, A. D. Bacher, N. Bateman, G. P. A. Berg, J. C. Blackmon, A. E. Champagne, B. Davis, A. J. Howard, J. Liu, B. Lund, Z. Q. Mao, D. M. Markoff, P. D. Parker, M. S. Smith, E. J. Stephenson, K. B. Swartz, S. Utku, R. B. Vogelaar, and K. Yildiz

  • Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124
  • Nuclear Physics Laboratory GL-10, University of Washington, Seattle, Washington 98195
  • Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
  • Indiana University Cyclotron Facility, Bloomington, Indiana 47408
  • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
  • Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27706
  • Department of Physics, Princeton University, Princeton, New Jersey 08544

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