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Background: Optical potentials are crucial ingredients for the prediction ofnuclear reaction rates needed in simulations of the astrophysical\gamma-process. Associated uncertainties are particularly large for reactionsinvolving \alpha-particles. This includes (\gamma,\alpha) reactions which areof special importance in the \gamma-process. Purpose: The measurement of(\alpha,n) reactions allows for an optimization of currently used\alpha-nucleus potentials. The reactions 165Ho(\alpha,n) and 166Er(\alpha,n)probe the optical model in a mass region where \gamma-process calculationsexhibit an underproduction of p nuclei which is not yet understood. Method: Toinvestigate the energy-dependent cross sections of the reactions165Ho(\alpha,n) and 166Er(\alpha,n) close to the reaction threshold,self-supporting metallic foils were irradiated with \alpha-particles using theFN tandem Van de Graaff accelerator at University of Notre Dame. The inducedactivity was determined afterwards by monitoring the specific \beta-decaychannels. Results: Hauser-Feshbach predictions with a widely used global\alpha-potential describe the data well at energies where the cross sectionsare almost exclusively sensitive to the \alpha-widths. Increasing discrepanciesappear towards the reaction threshold at lower energy. Conclusions: The testedglobal \alpha-potential is suitable at energies above 14 MeV, while amodification seems necessary close to the reaction threshold. Since the \gamma-and neutron width show non-negligible impact on the predictions, complementarydata are required to judge whether or not the discrepancies found can to besolely assigned to the \alpha-width.

physical review. c. nuclear physics/physical review. c, nuclear physics

Experimental cross sections of 165Ho(\alpha,n)168Tm and  166Er(\alpha,n)169Yb for optical potential studies relevant for the  astrophysical \gamma-process