Measurement of O17(p,γ)F18 between the narrow resonances at Erlab=193 and 519 keV

Physics – Nuclear Physics

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Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Other Resonances, Radiative Capture, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments

Scientific paper

The O17(p,γ)F18 reaction sensitively influences hydrogen burning nucleosynthesis in a number of stellar sites, including classical novae. These thermonuclear explosions, taking place in close binary star systems, produce peak temperatures in the range of T=100-400 MK. Recent results indicate that the thermonuclear rates for this reaction in this particular temperature range are dominated by the direct capture process. We report on the measurement of the O17(p,γ)F18 cross section between the narrow resonances at Erlab=193 and 519 keV, where the S factor is expected to vary smoothly with energy. We extract the direct capture contribution from the total cross section and demonstrate that earlier data are inconsistent with our results.

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