The ETCC instrument detected a 7.9 sigma gamma-ray excess from the Galactic center in the sub-MeV band during a one-day balloon flight, with positronium flux consistent with INTEGRAL measurements.
Sato, Analytical model for estimating the zenith angle dependence of terrestrial cosmic ray fluxes, PLOS ONE 11, 1 (2016)
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Observation of Galactic center in the sub-MeV gamma-ray band with electron-tracking Compton camera
The ETCC instrument detected a 7.9 sigma gamma-ray excess from the Galactic center in the sub-MeV band during a one-day balloon flight, with positronium flux consistent with INTEGRAL measurements.