First Direct Measurement of the Resonant ^17F(p,γ)^18Ne Reaction Rate

Details First Direct Measurement of the Resonant ^17F(p,γ)^18Ne Reaction Rate First Direct Measurement of the Resonant ^17F(p,γ)^18Ne Reaction Rate

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..aprq12003c&link_type=abstract

American Physical Society, 2009 APS April Meeting, May 2-5, 2009, abstract #Q12.003

Astronomy and Astrophysics

Astrophysics

Scientific paper

Of significant importance in astrophysical events like novae and x-ray bursts is the rate of the ^17F(p,γ)^18Ne reaction, where it contributes to element synthesis and energy generation. It is crucial for the production of radioactive ^18F in such scenarios, which is a target of gamma-ray telescopes like GLAST and INTEGRAL. However, the ^17F(p,γ)^18Ne reaction rate had not been determined experimentally. 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, which is directly related to the reaction rate, remained 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 resonance strength and γ partial width for the 599.8 keV resonance was deduced, as well as an upper limit on the direct capture cross section at an energy of 800 keV. These results have been used to calculate a new reaction rate in the temperature range of interest, and the preliminary implications of this new, faster rate will be discussed.

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