[en] In the framework of the present thesis with the reactions ⁴⁰Ar+Th and ⁴⁰Ar+Au at 30 MeV/nucleon studies on the reaction mechanisms in peripheral collisions in the intermediate energy range were performed. Peripheral reactions were selected since a heavy projectile fragment with Z ≥ 12 was detected. From the opening angle of the two fission fragments the linear momentum transfer to the target nucleus was determined. The fission probability for thorium and gold was determined in dependence on the charge number of the projectile fragment. For thorium the fission probability amounts in the mean to 50% and varies only weakly with Z_proj. For gold the value for Z_proj ≥ 16 lies near zero and increases with decreasing projectile rest to 30%. Furthermore the angular momentum transfer in the primary reaction was determined by means of the linear momentum transfer. The angular momentum at time of the fission was determined by the measured anisotropy of the fission fragments and the fission probability. The angular momentum transfer increases with decreasing projectile fragment and reaches in the primary reaction for Z=12 about 50-60 ℎ while it amounts in the secondary reaction independently on projectile fragment for thorium to ≅ 20 ℎ and for gold to ≅ 30 ℎ. (orig./HSI)