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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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Ageno et al. (1940) studied this question.
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