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SUMMARY:Modifications of method for low energy gamma incident angle recons
 truction in GAMMA-400 gamma-ray telescope
DTSTART;VALUE=DATE-TIME:20161013T133000Z
DTEND;VALUE=DATE-TIME:20161013T134500Z
DTSTAMP;VALUE=DATE-TIME:20260720T123706Z
UID:indico-contribution-569@cern.ch
DESCRIPTION:Speakers: Alexey Leonov (National Research Nuclear University 
 MEPhI (Moscow Engineering Physics Institute)\, P.N. Lebedev Physical Insti
 tute of the Russian Academy of Sciences)\nModifying a method of incident a
 ngle reconstruction for low-energy gamma rays in the GAMMA-400 gamma-ray t
 elescope.\n\nThe GAMMA-400 gamma-ray telescope is designed to measure the 
 gamma-ray fluxes in the energy range from 20 MeV to 1 TeV\, performing a s
 ensitive search in high-energy gamma-ray emission when annihilating or dec
 aying dark matter particles. Such measurements also will concern the follo
 wing scientific goals: searching for new and studying known Galactic and e
 xtragalactic discrete high-energy gamma-ray sources: supernova remnants\, 
 pulsars\, accreting objects\, microquasars\, active galactic nuclei\, blaz
 ars\, quasars\; studying their structure with high angular resolution and 
 measuring their energy spectra and luminosity with high-energy resolution\
 ; identifying discrete gamma-ray sources with known sources in other energ
 y ranges. The major advantage of the GAMMA-400 instrument is excellent ang
 ular and energy resolutions for gamma rays above 10 GeV. The gamma-ray tel
 escope angular and energy resolutions for the main aperture at 100-GeV gam
 ma rays are ~0.01° and ~1%\, respectively.\nThe motivation of presented r
 esults is to improve physical characteristics of the GAMMA-400 gamma-ray t
 elescope in the energy range of ~10-100 MeV\, most unexplored range today.
  Such observations are crucial today for a number of first-rank problems f
 aced by modern astrophysics and fundamental physics\, including the origin
  of chemical elements and cosmic rays\, the nature of dark matter\, and th
 e applicability range of the fundamental laws of physics. To improve incid
 ent angle reconstruction accuracy for low-energy gamma rays the special an
 alysis of topology of pair-conversion events in thin layers of converter w
 as performed. Choosing the pair-conversion events with more precise vertic
 al localization allows us to obtain significantly better angular resolutio
 n in comparison with previous and current space and ground-based experimen
 ts. For 50-MeV gamma rays the GAMMA-400 gamma-ray telescope angular resolu
 tion is better than 5°.\n\nhttps://indico.particle.mephi.ru/event/4/contr
 ibutions/569/
LOCATION:Milan Hotel Verdi
URL:https://indico.particle.mephi.ru/event/4/contributions/569/
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