Abstract
THE intensity of vertically directed mesotrons at different heights in the atmosphere has been measured by E. G. Dymond in a series of balloon flights. It is found that the intensity rises to a maximum of nine times the ground level value at an air pressure of about 80 mm. mercury. In order to bring the theoretical intensity variations, derived by Euler and Heisenberg, into agreement with these experimental results, it is suggested that there is a minimum energy of formation of mesotrons in the upper atmosphere, of about 8 × 108 ev.
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Points from Foregoing Letters. Nature 144, 788 (1939). https://doi.org/10.1038/144788b0
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DOI: https://doi.org/10.1038/144788b0