[en] In this thesis the results are presented and discussed from two experiments, performed to investigate the nuclear structure of two N = 50 nuclei: a high resolution inelastic proton scattering experiment on ⁹⁰Zr, described in chapter II, and a high resolution inelastic electron scattering experiment on ⁸⁸Sr, described in chapters III and IV. The results obtained in the ⁸⁸Sr(e,e') experiment for the 1⁺ state at 3.486 MeV excitation energy are described separately in chapter V. The ⁹⁰Zr(p,p') experiment was performed at a bombarding energy of 25 MeV with a resolution of 12 to 16 keV. The ⁸⁸Sr(e,e') measurements were performed at two laboratories with an overall resolution between 20 and 60 keV. (Auth.)