Constraining the 6.05 MeV 0+ and 6.13 MeV 3- cascade transitions in the 12C(α,γ)16O reaction using the Asymptotic Normalization Coefficients
Abstract
Background. The 12C(α,γ)16O reaction plays a fundamental role in astrophysics and needs to be known with accuracy better than 10%. Cascade γ transitions through the excited states of 16O are contributing to the uncertainty. Purpose. To constrain the contribution of the 0+ (6.05 MeV) and 3- (6.13 MeV) cascade transitions. Method. The α Asymptotic Normalization Coefficient for these states were measured using the α-transfer reaction 12C(6Li,d)16O at sub-Coulomb energies. Results. The 0+ and 3- cascade transitions contribution was found to be 1.960.3 keV b and 0.120.04 keV b for destructive interference of the direct and resonance capture and 4.360.45 keV b and 1.440.12 keV b for constructive interference respectively. Conclusions. The combined contribution of the 0+ and 3- cascade transitions to the reaction at 300 keV does not exceed 4%. Significant uncertainties have been dramatically reduced.
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