MEGA-A next generation mission in Medium Energy Gamma-Ray Astronomy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma-Ray Astronomy, Gamma-Ray Detection, Gamma-Ray Sources (Astronomical), Astronomical Atlases, Astronomical Catalogues, Nucleosynthesis, Cosmic Background Radiation, Artificial Satellites

Scientific paper

A Medium Energy Gamma-Ray Astronomy (MEGA) detector is being developed and proposed for a small satellite mission. MEGA intends to improve the sensitivity at medium γ-ray energies (0.4-50 MeV) by at least an order of magnitude with respect to past instruments. Its large field of view will be especially important for the discovery of transient sources and for conducting all-sky surveys. Key science objectives for MEGA are the investigation of cosmic high-energy accelerators and of nucleosynthesis sites with γ-ray lines. The large-scale structure of the galactic and cosmic diffuse background is another important goal for this mission. MEGA records and images γ-ray events by completely tracking Compton and pair creation interactions in a stack of double sided Si-strip track detectors and 3-D resolving CsI calorimeters. .

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