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Phys. Rev. C 62, 055804 (2000) [14 pages]

The astrophysically important 3+ state in 18Ne and the 17F(p,γ)18Ne stellar rate

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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 06520-8124
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 19 June 2000; published 19 October 2000

Knowledge of the 17F(p,γ)18Ne reaction rate is important for understanding stellar explosions, but it was uncertain because the properties of an expected but previously unobserved 3+ state in 18Ne were not known. This state would provide a strong s-wave resonance for the 17F+p system and, depending on its excitation energy, could dominate the stellar reaction rate at temperatures above 0.2 GK. 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 (HRIBF). We find that the state lies at a center-of-mass energy of Er=599.8±1.5stat±2.0sys keV (Ex=4523.7±2.9keV) and has a width of Γ=18±2stat±1syskeV. The measured properties of the resonance are only consistent with a Jπ=3+ assignment.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.62.055804
DOI:
10.1103/PhysRevC.62.055804
PACS:
26.30.+k, 25.40.Cm, 25.60.Bx, 27.20.+n

*Present address: Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599.

†Present address: Institute of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark.

 
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