Abstract
THE photographic emulsion method has been applied to the determination of the mean life-time of µ-mesons from their anomalous absorption. Ilford C2 plates with emulsion thicknesses 140 µ, 150 µ and 185 µ were exposed to cosmic radiation under controlled conditions for 42 days during the winter of 1950 in the High Tatra Mountains. One batch of plates was exposed without any absorber at Skalnaté Pleso (1,780 m.) and another one was placed on the top of Lomnický Štít (2,640 m.) under 12 cm. of lead absorber, corresponding in stopping power to the layer of air, 85 gm./cm.2, between the two stations. The plates were developed by the freezing method of C. C. Dilworth1.
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References
Dilworth, C. C., Occhialini, G. P. S., and Vermaesen, L., Bull. Centre Phys. Nuc., Bruxelles, Note No. 13 a (1949).
Rossi, B., and Hall, D. B., Phys. Rev., 59, 223 (1941).
Fermi, E., Phys. Rev., 57, 485 (1940).
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PERNEGR, J. Determination of the Mean Life-time of μ-Mesons. Nature 168, 1004 (1951). https://doi.org/10.1038/1681004a0
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DOI: https://doi.org/10.1038/1681004a0
