In this work, it has been recording the alpha particles emitted from an Amerecium-241 source, and scattered by a gold and Aluminum thin foils as a function of the scattering angle q (0o-30o), using a semiconductor detector and Rutherford scattering chamber. It always has been measuring the differential cross section resulting from this scattering, and experimentally determining the atomic number of Gold and Aluminum. Comparison between experimental and theoretical results shows a good agreement.