Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..ses.kc001s&link_type=abstract
American Physical Society, 67th Annual Meeting of the APS Southeastern Section November 2 - 4, 2000 Mississippi State University
Astronomy and Astrophysics
Astrophysics
Scientific paper
Radioactive beams of ^17F and ^18F from ORNL's Holifield Radioactive Ion Beam Facility have been used to investigate nuclear reactions of importance to understanding nova explosions and X-ray bursts. We have measured the ^17F(p,p)^17F excitation function and found the first unambiguous evidence for a 3^+ state in ^18Ne that dominates the ^17F(p,γ)^18Ne reaction at temperatures and densities found in stellar explosions. The excitation energy and width of this resonance were measured.(D. W. Bardayan et al., Phys. Rev. Lett. 83) (1999) 45. Our new ^17F(p,γ)^18Ne reaction rate has been used in a nova nucleosynthesis model to determine its astrophysical implications. We have measured the ^17F(p,α)^14O excitation function to determine the ^14O(α,p)^17F reaction rate over the entire range of temperatures relevant for stellar explosions.(J. C. Blackmon et al., Nucl. Phys. A. (2000) in preparation.) We have additionally measured the ^18F(p,p)^18F and ^18F(p,α)^15O cross sections to determine the properties of a ^19Ne resonance that dominates the ^18F(p,γ)^19Ne and ^18F(p,α)^15O reactions during stellar explosions.(D. W. Bardayan et al., Phys. Rev. C. (2000) in press.) Results from these experiments and astrophysical implications will be discussed. Future radioactive beam measurements and related activities in theoretical astrophysics and nuclear astrophysics data will briefly be described.
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