Abstract
In energetic nova events, breakout of the hot CNO cycle may proceed via the reaction chain 15O(α,γ)19Ne(p,γ)20Na. This triggers a sequence of rapid proton captures and beta decays which can process CNO nuclei to heavier elements (rp‐process). The rate of the 19Ne(p,γ)20Na reaction is sensitive to resonances in the 19Ne+p system. The first excited state above the proton threshold of 2.199 MeV in 20Na (at Ex=2.646 MeV) is expected to be the most important in determining the reaction rate. The gamma width (Γγ) of this state is still unknown and the Jπ assignment of this state is currently the subject of debate (1). We have performed 20Ne(3He,tγ) experiments to determine the branching ratio Γγ/Γ of the Ex=2.646 MeV excited state in 20Na. Some preliminary results of these experiments will be presented.
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