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Total reaction cross section $σ_{\rm{reac}}$ of $α$-induced reactions from elastic scattering: the example $^{140}$Ce($α$,$α$)$^{140}$Ce

Angular distributions of elastic $^{140}$Ce($α$,$α$)$^{140}$Ce scattering are analyzed in the framework of the optical model from low energies around the Coulomb barrier up to about 40\,MeV. From the local fits the total reaction cross section $σ_{\rm{reac}}$ is extracted. This procedure requires experimental scattering data with small uncertainties. The results for $σ_{\rm{reac}}$ are compared to predictions of different systematic global potentials. It is found that the total reaction cross section $σ_{\rm{reac}}$ is well predicted from all global potentials under study although the reproduction of the angular distributions is not perfect in all cases. In addition, the lower energy limit for the extraction of $σ_{\rm{reac}}$ from elastic scattering angular distributions is analyzed. Finally, the potentials under study are used to calculate the $^{143}$Nd(n,$α$)$^{140}$Ce cross section, and the predictions are compared to experimental data.