Universe (Aug 2023)

The Upcoming GAMMA-400 Experiment

  • Sergey I. Suchkov,
  • Irina V. Arkhangelskaja,
  • Andrey I. Arkhangelskiy,
  • Aleksey V. Bakaldin,
  • Irina V. Chernysheva,
  • Arkady M. Galper,
  • Oleg D. Dalkarov,
  • Andrey E. Egorov,
  • Maxim D. Kheymits,
  • Mikhail G. Korotkov,
  • Aleksey A. Leonov,
  • Svetlana A. Leonova,
  • Alexandr G. Malinin,
  • Vladimir V. Mikhailov,
  • Pavel Yu Minaev,
  • Nikolay Yu. Pappe,
  • Mikhail V. Razumeyko,
  • Nikolay P. Topchiev,
  • Yuri T. Yurkin

DOI
https://doi.org/10.3390/universe9080369
Journal volume & issue
Vol. 9, no. 8
p. 369

Abstract

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The upcoming GAMMA-400 experiment will be implemented aboard the Russian astrophysical space observatory, which will be operating in a highly elliptical orbit over a period of 7 years to provide new data on gamma-ray emissions and cosmic-ray electron + positron fluxes, mainly from the galactic plane, the Galactic Center, and the Sun. The main observation mode will be a continuous point-source mode, with a duration of up to ~100 days. The GAMMA-400 gamma-ray telescope will study high-energy gamma-ray emissions of up to several TeV and cosmic-ray electrons + positrons up to 20 TeV. The GAMMA-400 telescope will have a high angular resolution, high energy and time resolutions, and a very good separation efficiency for separating gamma rays from the cosmic-ray background and the electrons + positrons from protons. A distinctive feature of the GAMMA-400 gamma-ray telescope is its wonderful angular resolution for energies of >30 GeV (0.01° for Eγ = 100 GeV), which exceeds the resolutions of space-based and ground-based gamma-ray telescopes by a factor of 5–10. GAMMA-400 studies can reveal gamma-ray emissions from dark matter particles’ annihilation or decay, identify many unassociated, discrete sources, explore the extended sources’ structures, and improve the cosmic-ray electron + positron spectra data for energies of >30 GeV.

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