%0 Journal Article
%T Constraining the 6.05 MeV 0$^+$ and 6.13 MeV 3$^-$ cascade transitions in the $^{12}$C($¦Á$,$¦Ã$)$^{16}$O reaction using the Asymptotic Normalization Coefficients
%A M. L. Avila
%A G. V. Rogachev
%A E. Koshchiy
%A L. T. Baby
%A J. Belarge
%A K. W. Kemper
%A A. N. Kuchera
%A A. M. Mukhamedzhanov
%A D. Santiago-Gonzalez
%A E. Uberseder
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevLett.114.071101
%X Background. The $^{12}$C$(\alpha,\gamma)^{16}$O reaction plays a fundamental role in astrophysics and needs to be known with accuracy better than 10%. Cascade $\gamma$ transitions through the excited states of $^{16}$O 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 $\alpha$ Asymptotic Normalization Coefficient for these states were measured using the $\alpha$-transfer reaction $^{12}$C$(^6$Li,$d)^{16}$O at sub-Coulomb energies. Results. The 0$^+$ and 3$^-$ cascade transitions contribution was found to be 1.96$\pm$0.3 keV b and 0.12$\pm$0.04 keV b for destructive interference of the direct and resonance capture and 4.36$\pm$0.45 keV b and 1.44$\pm$0.12 keV b for constructive interference respectively. Conclusions. The combined contribution of the 0$^+$ and 3$^-$ cascade transitions to the reaction at 300 keV does not exceed 4%. Significant uncertainties have been dramatically reduced.
%U http://arxiv.org/abs/1410.4592v2