First experimental constraints on the interference of 32^+ resonances in the ^18F(p,α)^15O reaction

Details First experimental constraints on the interference of 32^+ resonances in the ^18F(p,α)^15O reaction First experimental constraints on the interference of 32^+ resonances in the ^18F(p,α)^15O reaction

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..dnp.ce011c&link_type=abstract

American Physical Society, Division of Nuclear Physics Annual Meeting, October 25-28, 2006, abstract #CE.011

Physics

Nuclear Physics

Scientific paper

The ^18F(p,α)^15O reaction plays a crucial role in understanding γ-ray emission from novae. Because of the importance of understanding the ^18F + p reactions, a number of studies of the A=19 isobars have been made using stable and exotic beams. The interference effects among J^π = 32^+ resonances in the ^18F + p system, however, have never been measured, but they can change the S-factor by a factor of 20 at nova energies. R- matrix calculations indicate that the cross sections above the Ec.m. = 665 keV resonance are sensitive to the interference between the Ec.m. = 8, 38, and 665 keV resonances. In order to study the interference effects, an excitation function for the ^1H(^18F,α)^15 O reaction has been measured in the energy range of Ec.m. = 663-877 keV using radioactive ^18F beams at the Holifield Radioactive Ion Beam Facility. By measuring the ^18F(p,α)^15O cross section off resonance and comparing the cross section with theoretical calculations, we could provide the first experimental constraints on the interference of 32^+ resonances.

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