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Abstract:
Ultra-high energy γ-rays have been observed by emulsion chambers exposed at Yunnan Station (3200m, 700g/cm2 atmospheric depth). The integral spectrum, the vertical intensity and the attenuation length in air of the gamma rays in the energy region 2 TeV to 30 TeV are presented. The results of gamma ray families with total observed energies ranging from 5 TeV to 70 TeV are discussed.
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