Abstract
IN a communication in NATURE1 it was concluded that the heavy ionization tracks found in Ilford New Halftone plates kept exposed to cosmic rays at Sandakphu (12,000 ft.) were chiefly due to mesotrons. The basis of this conclusion was a comparison of the mean grain spacing and curvature of tracks due to cosmic rays with tracks due to protons of known energies on similar plates.
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References
NATURE, 147, 240 (1941).
Williams, E. J., Proc. Ray. Soc., A., 169, 539 (1939).
Wambacher, Phys. Z., 39, 888 (1939).
Dunning, Phys. Rev., 45, 586 (1934); Bonner, Mott and Smith, Phys. Rev., 46, 258 (1934).
Blau, J. Phys. et Rad., 61 (1934).
Bethe, Phys. Sev., 57, 260 (1940) estimates that the most reliable measured values of µ lie between 150 and 220 m0. When certain corrections are made, it is expected that the former will be increased by at least 10 percent.
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BOSE, D., CHOUDHURI, B. A PHOTOGRAPHIC METHOD OF ESTIMATING THE MASS OF THE MESOTRON. Nature 148, 259–260 (1941). https://doi.org/10.1038/148259a0
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DOI: https://doi.org/10.1038/148259a0
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