Abstract
Gamma-ray lines at 0.511 MeV and 1.632 MeV have been observed at high rigidity (12.5 GV), and up to 4 g cm−2, during stratospheric balloon flights launched from São José dos Campos, Brazil. The flux of these lines are compared with the results obtained at other rigidity regions. The intensity variations of the most prominent of these lines, the annihilation line at 0.511 MeV, is found to be compatible, at various atmospheric depths, with theoretical predictions. This study has led to the estimation of an upper limit for the flux of the extra-terrestrial 0.511 MeV gamma-ray line.
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