Method of incident low-energy gamma-ray direction reconstruction in the GAMMA-400 gamma-ray space telescope

• Published in: Journal of physics. Conference series 2016-01, Vol.675 (3), p.32012, Article 032012
• Main Authors: Kheymits, M D, Leonov, A A, Zverev, V G, Galper, A M, Arkhangelskaya, I V, Arkhangelskiy, A I, Suchkov, S I, Topchiev, N P, Yurkin, Yu T, Bakaldin, A V, Dalkarov, O D
• Format: Article
• Language: English
• Subjects: Angular resolution; Converters; Cosmic rays; Energy spectra; Gamma ray astronomy; Gamma ray bursts; Gamma ray sources; Gamma rays; Particle decay; Physics; Position sensing; Reconstruction; Space telescopes; Spaceborne telescopes
• ISSN: 1742-6588; 1742-6596; 1742-6596
• DOI: 10.1088/1742-6596/675/3/032012

The GAMMA-400 gamma-ray space-based telescope has as its main goals to measure cosmic γ-ray fluxes and the electron-positron cosmic-ray component produced, theoretically, in dark-matter-particles decay or annihilation processes, to search for discrete γ-ray sources and study them in detail, to examine the energy spectra of diffuse γ-rays - both galactic and extragalactic - and to study gamma-ray bursts (GRBs) and γ-rays from the active Sun. Scientific goals of GAMMA-400 telescope require fine angular resolution. The telescope is of a pair-production type. In the converter-tracker, the incident gamma-ray photon converts into electron-positron pair in the tungsten layer and then the tracks are detected by silicon- strip position-sensitive detectors. Multiple scattering processes become a significant obstacle in the incident-gamma direction reconstruction for energies below several gigaelectronvolts. The method of utilising this process to improve the resolution is proposed in the presented work.