Narrow Muon Bundles below Ground

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Abstract
The observation of muon bundles caused by cosmic rays was carried out for 17,000 hours by means of spark chamber at 30 m.w.e. below ground. The muon bundles in a narrow region of 20∼30 cm in diameter were observed over the expectation from the fluctuation of spatial distribution or muons by the Monte Carlo method. Their frequency was about 2×10 -4 m -2 h -1 . The frequency of these muon bundles cannot be explained as known interaction processes without extreme assumptions.

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