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The main goal for the GAMMA-400 gamma-ray telescope mission is to perform asensitive search for signatures of dark matter particles in high-energygamma-ray emission. Measurements will also concern the following scientificgoals: detailed study of the Galactic center region, investigation of point andextended gamma-ray sources, studies of the energy spectra of Galactic andextragalactic diffuse emissions. To perform these measurements the GAMMA-400gamma-ray telescope possesses unique physical characteristics for energy rangefrom ~20 MeV to ~1000 GeV in comparison with previous and current space andground-based experiments. The major advantage of the GAMMA-400 instrument isexcellent angular and energy resolutions for gamma-rays above 10 GeV. Thegamma-ray telescope angular and energy resolutions for the main aperture at100-GeV gamma rays are ~0.01 deg and ~1%, respectively. The special goal is toimprove physical characteristics in the low- energy range from ~20 MeV to 100MeV. Minimizing the amount of dead matter in the telescope aperture allows usto obtain the angular and energy resolutions better in this range than incurrent space missions. The gamma-ray telescope angular resolution at 50-MeVgamma rays is better than 5 deg and energy resolution is ~10%. We report themethod providing these results.

Improvement of the GAMMA-400 physical scheme for precision gamma-ray emission investigations