Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..aprj13006h&link_type=abstract
American Physical Society, APS April Meeting, April 16-19, 2005, abstract #J13.006
Astronomy and Astrophysics
Astronomy
Scientific paper
In novae, the survival of the long-lived radioisotope ^18F, which is important in nova gamma-ray astronomy, depends on the parameters of excited states of ^19Ne, which dictate the rates of the ^18F(p,α)^15O and ^18F(p,γ)^19Ne reactions. Of particular importance is the level structure of ^19Ne above the proton threshold (Ex = 6.411 MeV), where analogs for several states in the mirror nucleus ^19F have not yet been identified in ^19Ne. The present experiment involves a study of the ^17O(^3He,n)^19Ne reaction and was performed at the Edwards Accelerator Laboratory at Ohio University. Neutron time-of-flight techniques were employed to study ^19Ne excited levels, particularly those between 6 and 7 MeV. In addition to measuring the energy of observed levels and their widths provided they are large enough, the cross section of the reaction to these levels can be compared to Hauser-Feshbach calculations in order to identify the spin of the states. The significance of these levels in relation to proton-induced reactions on ^18F will be discussed.
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