The Anomalous Absorption of the Hard Component of Cosmic Rays in Air

Abstract
The anomalously large absorption of mesotrons in air has been confirmed by a comparison of the vertical intensity of mesotrons at two different altitudes (500 m and 3460 m). At 3460 m the vertical intensity has also been compared with the intensity under a zenith angle of 45°. If the results obtained are interpreted according to the hypothesis of the instability of the mesotron, they are found to be consistent with the assumption of a proper lifetime of 4 or 5 microseconds for the mesotron.

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