Abstract
IN a coal mine in the neighbourhood of Budapest, at a depth of 315 m. below the surface, we made measurements of the cosmic ray intensity with triple coincidence apparatus. To obtain still thicker layers of material we measured the intensity at different angles from the vertical, using a very narrow aperture. The results of these experiments show that cosmic rays penetrate through a layer with a thickness of 2,500 m. water-equivalent. For corpuscular rays this will mean that the energy of the particles must surpass 1012 evolt, using the formula of Bethe. The intensity distribution was found to be as follows: 1,700 coincidences per hour on the surface, 0·78 coincidences per hour at an effective depth of 700 m. of water and 0·09 coincidences per hour at 2,500 m. effective depth.
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BARNÓTHY, J., FORRÓ, M. Measurements of Cosmic Ray Intensity in a Deep Mine. Nature 138, 325 (1936). https://doi.org/10.1038/138325b0
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DOI: https://doi.org/10.1038/138325b0
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