Abstract
Large underground (underwater) detectors (such as ‘Baikal’ and DUMAND) are discussed for their possible use as gamma-ray telescopes. The signal is caused by high-energy muons (E μ ≳ 30–100 TeV) produced by the primary gamma-radiation in the Earth's atmosphere. The production of gamma-rays in the source through the reaction p + p → π 0 + X is calculated for a low density target of arbitrary thickness taking the electromagnetic cascade into account. The muon production by gamma-rays in the Earth's atmosphere is calculated using three processes: (i) photoproduction of π- and K-mesons followed by decay to muons, (ii) the direct production of μ+ μ−-pairs: γ + Z → Z + μ + + μ−, and (iii) photoproduction of charmed particles. It is shown that for thin sources with a flat spectrum (integral exponent γ = 1.1) a large (S = 0.1 km2) underground detector can detect both neutrinos and gamma-quanta generated by the source. Finally we compare the performances of underground detectors with S = 0.1 km2 for the search of gamma sources at E = 100 TeV with those of the previously proposed 1 km2 EAS array.
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Berezinsky, V.S., Cini-Castagnoli, G., Kudryavtsev, V.A. et al. High-energy gamma-astronomy with large underground detectors. Space Sci Rev 49, 227–237 (1989). https://doi.org/10.1007/BF00173758
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DOI: https://doi.org/10.1007/BF00173758