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VOLUME 57 (1993) | ISSUE 6 | PAGE 323
A search for diffuse emission of UHE gamma rays in southern sky from observation of hadronless air showers
The lateral distributions of hadrons in air showers have been determined precisely as a function of the core distance, the shower size, the zenith angle and age, and the hadronless showers as candidates of gamma-ray-initiated air showers can be discriminated with this average lateral distribution. There is no evidence of the detection of gamma rays from any diffused regions with enough significance, but the arrival directions of hadronless air showers selected under strict conditions have an anisotropy in the equatorial coordinates.