Physics
Scientific paper
May 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968saosr.277.....h&link_type=abstract
SAO Special Report #277 (1968)
Physics
1
Scientific paper
A gamma-ray detector consisting of scintillation counters and a spark chamber to convert gamma rays to electron-positron pairs was flown with a balloon to an altitude of 125,000 feet for 7 hours on 28 May 1966. The image of the resulting charged- particle tracks in the spark chamber was transmitted from a vidicon television camera in the balloon gondola to a ground receiving station, where it was recorded on video tape and movie film in real time. The direction of each gamma ray recorded was reconstructed in celestial coordinates. No definite celestial sources of gamma rays were found. Using the integrated-likelihood method, we find 95% confidence flux upper limits of 8.7× 10-5 (cm2 sec)-1 from the Crab Nebula, 9.4 X 10-5 (cm2 sec)-1 from the sun, and 2.7 X 10-4 (cm2 sec sr)-1 from the anticenter of the Galaxy, for photon energies above 100 MeV. Some possible evidence for gamma rays emitted during solar falres is given. The photon spectrum at 4 g cm-2 atmospheric depth is reported. The angular resolution of the detector and method of determining statistical upper limits of fluxes are thoroughly discussed.
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