Other
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvc..63f5802b&link_type=abstract
Physical Review C, vol. 63, Issue 6, id. 065802
Other
36
6<=A<=19, Elastic Proton Scattering, Reactions Induced By Unstable Nuclei, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments
Scientific paper
Knowledge of the astrophysical rate of the 18F(p,α)15O reaction is important for understanding the γ-ray emission expected from novae and heavy-element production in x-ray bursts. The rate of this reaction is dominated at temperatures above ~0.4 GK by a resonance near 7.08 MeV excitation energy in 19Ne. The 18F(p,α)15O rate has been uncertain in part because of disagreements among previous measurements concerning the resonance strength and excitation energy of this state. To resolve these uncertainties, we have made simultaneous measurements of the 1H(18F,p)18F and 1H(18F,α)15O excitation functions using a radioactive 18F beam at the ORNL Holifield Radioactive Ion Beam Facility. A simultaneous fit of the data sets has been performed, and the best fit was obtained with a center-of-mass resonance energy of 664.7+/-1.6 keV (Ex=7076+/-2 keV), a total width of 39.0+/-1.6 keV, a proton branching ratio of Γp/Γ=0.39+/-0.02, and a resonance strength of ωγ=6.2+/-0.3 keV.
Bardayan Daniel W.
Blackmon Jeff C.
Bradfield-Smith W.
Brune Carl R.
Champagne Arthur E.
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