Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dnp.de012b&link_type=abstract
American Physical Society, 2002 Fall Meeting of the Division of Nuclear , abstract #DE.012
Astronomy and Astrophysics
Astrophysics
Scientific paper
Nuclear reactions involving proton-rich radioactive isotopes are important in the explosive hydrogen burning that powers novae and X-ray bursts. Despite numerous studies, substantial uncertainties have persisted in some key reaction rates. Measurements using beams of ^17F (t_1/2 = 64 s) and ^18F (t_1/2 = 1.8 h) at ORNL's Holifield Radioactive Ion Beam Facility (HRIBF) have resolved important uncertainties in the ^14O(α,p)^17F, ^17F(p,γ)^18Ne, and ^18F(p,α)^15O reaction rates. The HRIBF's low- and medium-energy beams have enabled the use of direct and indirect studies of astrophysically-important reactions to better determine these rates. The indirect studies include scattering and transfer reaction measurements to determine the single-particle structure of the compound nuclei of interest, as well as measurements of the time-inverse of reactions. We have bombarded low-mass targets with radioactive fluorine beams and detected the reaction products in coincidence for the production of nearly background-free spectra using arrays of silicon strip detectors, gas ionization counters, and microchannel plates. Recent results will be presented and the astrophysical implications discussed.
Bardayan Daniel W.
Blackmon Jeff C.
Smith Marcia S.
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