$\alpha$-cluster ANCs at sub-Coulomb energies for nuclear astrophysics

Many important $\alpha$-particle induced reactions can only be measured indirectly due to small cross section at energies of astrophysical interest. Extracting the Asymptotic Normalization Coefficients (ANCs) using sub-Coulomb $\alpha$-transfer reactions can been used as an effective method to determine properties of near-threshold resonances to constrain and drastically limit the uncertainties related to extrapolations procedures for key astrophysical reactions. We have applied this valuable tool to investigate the $\alpha$-transfer reactions $^{16}$O($^6$Li,d)$^{20}$Ne, $^{13}$C($^6$Li,d)$^{17}$O and $^{12}$C($^6$Li,d)$^{16}$O.