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Phys. Rev. Lett. 83, 45–48 (1999)

Observation of the Astrophysically Important 3+ State in 18Ne via Elastic Scattering of a Radioactive 17F Beam from 1H

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D. W. Bardayan1,2, J. C. Blackmon1, C. R. Brune3, A. E. Champagne3, A. A. Chen2, J. M. Cox4, T. Davinson5, V. Y. Hansper1,3, M. A. Hofstee6, B. A. Johnson4, R. L. Kozub4, Z. Ma1,7,8, P. D. Parker2, D. E. Pierce1, M. T. Rabban1, A. C. Shotter5, M. S. Smith1, K. B. Swartz2, D. W. Visser2, and P. J. Woods5
1Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
2A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511
3Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599
4Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505
5Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
6Department of Physics, Colorado School of Mines, Golden, Colorado 80401
7Chinese Institute for Atomic Energy, Beijing, 102413, People's Republic of China
8Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831

Received 4 March 1999; published in the issue dated 5 July 1999

See accompanying Physics Focus

The 17F(p,γ)18Ne reaction is important in stellar explosions, but its rate has been uncertain because of an expected 3+ state in 18Ne that has never been conclusively observed. This state would provide a strong ℓ = 0 resonance and, depending on its excitation energy, could dominate the stellar reaction rate. We have observed this missing 3+ state by measuring the 1H(17F,p)17F excitation function with a radioactive 17F beam at the ORNL Holifield Radioactive Ion Beam Facility. We find that the state lies at a center-of-mass energy of Er = 599.8±1.5stat±2.0sys keV ( Ex = 4523.7±2.9 keV) and has a width of Γ = 18±2stat±1sys keV.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.45
DOI:
10.1103/PhysRevLett.83.45
PACS:
27.20.+n, 25.40.Cm, 25.60.Bx, 26.30.+k
 
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