[en] Full text: Low energy alpha-nucleus optical potentials are an important ingredient of reaction cross section calculations relevant in various processes of heavy element nucleosynthesis, such as the astrophysical γ -process. The optical potential can be studied directly by high precision alpha elastic scattering experiments. In the Institute for Nuclear Research (Atomki) a systematic study of the optical potential has been carried in the last 15 years. One of the last studied isotope was the ⁶⁴Zn, where complete angular distributions were measured at two energies close above the Coulomb barrier. Through the example of this study, the experimental techniques needed for a precise alpha elastic scattering measurement will be presented. This research was realized in the frames of TAMOP 4.2.4. A/2-11-1-2012-0001 'National Excellence Program Elaborating and operating an inland student and researcher personal support system' The project was subsidized by the European Union and co-financed by the European Social Fund.