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We present the first results of a high-energy resolution gamma ray experiment in the upper atmosphere. This balloon experiment used a nitrogen-cooled Ge-Li detector, and its purpose was to search for γ ray lines between 400 keV and 8 MeV. Apart from the 511-keV annihilation line, we detected a feature that we attribute to the 6129-keV line from the second excited state of 16O. For this line we found a flux of 7.3 × 10−3 ± 4.4 × 10−3 photon/cm² s at ceiling altitude.
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Albernhe et al. (1976) studied this question.
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