ELASTIC SCATTERING OF He(21,3S) ATOMS BY Na(32S) ATOMS AT 68meV ENERGY E.Yu.Remeta, V.I.Kelemen, A.N.Zavilopulo, A.V.Snegursky Institute of Electron Physics, Ukrainian Academy of Sciences 21 Universitetska str., Uzhgorod, Ukraine Using the metastable spectroscopy method the differential elastic scattering cross section for He(23,1S) metastable atoms by the ground-state sodium atoms has been studied. The partial scattering phase-shifts have been calculated by using the variable-phase method within the framework of the optical potential approximation.