A balloon-altitude observation was conducted 1970 November 25, of the galactic-center region, at energies between 23 and 930 keV. The radiation detected from the 24 FWHM area of Sagittarius during the 7-hour observation has a differential photon number spectrum that may be approximated by a power law with a spectral index of 2.37 + 0.05; this is in satisfactory accord with the results obtained previously by others at low energies. In addition, the evidence for a spectral feature at 0.5 MeV is presented and discussed.
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R. C. Haymes (1972) studied this question.
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