Abstract
PROF. P. M. S. BLACKETT calculates the mean range of the mesotrons (particles of mass intermediate between that of the electron and that of the proton) from the relative intensity of the inclined cosmic rays to the vertical rays, and also from the absorption anomaly between air and water. He arrives at a value of 1 ·7 × 10-6 sec. for the decay time of a fast-moving mesotron, assuming its mass to be 150 times that of the electron. Prof. B. Rossi obtains a value of the same order of magnitude for the life of the mesotron from calculations based upon the anomaly of absorption of cosmic rays by air and by lead, when vertical and inclined counters were used.
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