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

الأصل · EN

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 1.96±0.3 keV b and 0.12±0.04 keV b for destructive interference of the direct and resonance capture and 4.36±0.45 keV b and 1.44±0.12 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.