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The 511 keV emission from positron annihilation in the Galaxy

Moskalenko, I. V.; Marcowith, A.; Diehl, R. +9 more

The first γ-ray line originating from outside the Solar System that was ever detected is the 511 keV emission from positron annihilation in the Galaxy. Despite 30 years of intense theoretical and observational investigation, the main sources of positrons have not been identified up to now. Observations in the 1990s with OSSE/CGRO (Oriented Scintil…