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New Astrophysical Reaction Rates for 18F(p, α)15O and 18F(p, γ)19Ne |
| SHU Neng-Chuan1,2; D. W. Bardayan2;J. C. Blackmon2;CHEN Yong-Shou1;R. L. Kozub3;P. D. Parker4;M. S. Smith2 |
| 1China Institute of Atomic Energy, Beijing 102413
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
3A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
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| Cite this article: |
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SHU Neng-Chuan, D. W. Bardayan, J. C. Blackmon et al 2003 Chin. Phys. Lett. 20 1470-1473 |
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Abstract The rates of the thermonuclear 18F(p, α)15O and 18F(p, γ)19Ne reactions in hot astrophysical environments are needed to understand gamma-ray emission from nova explosions. The rates for these reactions have been uncertain due to discrepancies in recent measurements, as well as to a lack of a comprehensive examination of the available structure information in the compound nucleus 19Ne. We have examined the latest experimental measurements with radioactive and stable beams, and made estimates of the unmeasured 19Ne nuclear level parameters, to generate new rates with uncertainties for these reactions. The rates are expressed as numerical values over the temperature range relevant for stellar explosions, as well as analytical expressions as functions of temperature in a format suitable for use in astrophysical simulations. Comparisons with the previous rate calculations are carried out, and the astrophysical implications are briefly discussed.
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| Keywords:
27.20.+n
25.40.Cm
25.60.-t
26.30.+k
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Published: 01 September 2003
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