TOTAL CROSS SECTIONS FOR POSITRON SCATTERING ON NITROGEN AT INTERMEDIATE ENERGIES Grzegorz P. Karwasz, Mario Barozzi, Roberto S. Brusa, and Antonio Zecca Istituto Nazionale per la Fisica della Materia Dipartimento di Fisica, Universita' di Trento, 38050 Povo (TN), Italy Preliminary total cross section measurements for positron scattering on molecular nitrogen have been performed between 500 eV and 2500 eV. A Ramsauer-type apparatus, previously used for electron scattering measurements has been modified. Electron and positron cross sections above 2000 eV concide within the experimental error bar.