Abstract
IN a long series of counter experiments, Wataghin, de Souze and Pompia1, and Jánossy2 and his co-workers have established the existence of showers of penetrating particles different from electron cascade showers and knock-on showers. It now seems probable that the theory of cosmic-ray mesons put forward recently by Hamilton, Heitler and Peng3 can account satisfactorily for these showers in terms of mesons (and neutrettos). These particles are assumed to be created by protons (or neutrons), of energies greater than 2 × 109 eV. by cascade or multiple processes.
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References
Wataghin, G., de Souze, M., and Pompia, P. A., Phys. Rev., 57, 61, 339 (1940).
Jánossy, L., Phys. Rev., 64, 345 (1943).
Hamilton, J., Heitler, W., and Peng, H. W., Phys. Rev., 64, 78 (1943).
Peng, H. W., Proc. Roy. Irish Acad., 49 A, 245 (1944).
Bose, D. M., Choudhuri, B., and Sinha, M., Phys. Rev., 65, 341 (1944).
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ROCHESTER, G. Cloud Chamber Photographs of Penetrating Showers. Nature 154, 399 (1944). https://doi.org/10.1038/154399a0
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DOI: https://doi.org/10.1038/154399a0
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