Abstract
THE heavy ionizing particles in the cosmic rays are so rare that it seems unlikely that much information can be obtained from experiments with cloud chambers. The only method at present available which can yield quantitative results is the method of direct photography, which has been used recently by several investigators mainly for investigating the nuclear disintegrations which the cosmic rays produce1,2. On a plate which has been exposed for a sufficiently long time is observed, in addition to a great wealth of phenomena associated with disintegration effects, a large number of single tracks probably due to protons or slow mesotrons.
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References
Blau and Wambacher, Sitz. Akad. Wien, 146, 623 (1937).
Schopper and Schopper, Phys. Z., 40, 22 (1939).
Schopper, Naturwiss., 25, 557 (1937).
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HEITLER, W., POWELL, C. & FERTEL, G. Heavy Cosmic Ray Particles at Jungfraujoch and Sea-Level. Nature 144, 283–284 (1939). https://doi.org/10.1038/144283a0
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DOI: https://doi.org/10.1038/144283a0
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