Experimental Study of 17O(p,α)14N and 17O(p,γ)18F for Classical Nova Nucleosynthesis

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Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Radiative Capture, Resonance Reactions, 6<=A<=19, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

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We investigated the proton-capture reactions on 17O occuring in classical nova explosions. We observed a previously undiscovered resonance at ERlab=194.1+/-0.6 keV in the 17O(p,α)14N reaction, with a measured resonance strength ωγpα=1.6+/-0.2 meV. We studied in the same experiment the 17O(p,γ)18F reaction by an activation method and the resonance-strength ratio was found to be ωγpα/ωγpγ=470+/-50. The corresponding excitation energy in the 18F compound nucleus was determined to be 5789.8+/-0.3 keV by γ-ray measurements using the 14N(α,γ)18F reaction. These new resonance properties have important consequences for 17O nucleosynthesis and γ-ray astronomy of classical novae.

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