First direct measurement of the 17F(p,γ)18Ne cross section
The rate of the 17F(p,γ)18Ne reaction is of significant importance in astrophysical events like novae and x-ray bursts. The decay of 17F is thought to help drive the expansion of the nova envelope, and the 17F(p,γ)18Ne reaction affects the production of 18F, a target of gamma-ray astronomy, as well as being an important link in the (α,p) reaction chain during the ignition phase of x-ray bursts. A 3+ state in 18Ne predicted to dominate the rate was found at 599.8 keV using the 17F(p,p)17F reaction , but the resonance strength was unknown. For the first time, the 17F(p,γ)18Ne reaction has been measured directly with the Daresbury Recoil Separator, using a mixed beam of radioactive 17F and stable 17O from the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. A γ width was found for the 599.8 keV resonance in 18Ne, and an upper limit on the direct capture S factor was determined at an intermediate energy of 800 keV. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlikeLicence.