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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 hadron-less air showers
The lateral distributions of hadrons in air showers have been determined precisely as a function of core distance, shower size, zenith angle and age, and hadron-less showers as candidates of gamma-ray initiated air showers could be discriminated with this average lateral distribution. There are no evidences for detection of gamma-rays from any diffused regions with an enough significance, but arrival directions of hadron-less air showers selected with a strict condition have anisotropy in equatorial coordi nates.