Abstract
The 15O( α, γ) 19Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E c.m.=504 keV which corresponds to a 19Ne excitation energy of E R=4.033 MeV. It is possible to model the 15O( α, γ) 19Ne reaction rate, if the branching ratio Γ α / Γ and the total resonance width Γ of this state are known. Results from an exploratory 18Ne(d,p) experiment performed in inverse kinematics at E lab=44.1 MeV and 10 6 pps beam intensity show that the 4.033 MeV state—among other resonances of astrophysical interest—is populated in this reaction ( dσ/ dΩ=0.5±0.2 mb/ sr at θ lab=138°). The determination of Γ α / Γ=0.28±0.13 for another 19Ne resonance at E R=4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available.
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