Abstract
WE have recently obtained a clear example of meson production in lead in an experiment in which counter-controlled, cloud-chamber photographs of penetrating showers were taken in a magnetic field of 3,400 gauss. There was a layer of lead 6·8 cm. in thickness above the chamber, and the counter arrangement was such that at least two particles in the shower had to penetrate 20 cm. of lead below the chamber. The chamber was filled to a pressure of 1·5 atmospheres with a mixture consisting of 80 percent argon and 20 percent oxygen.
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ROCHESTER, G., BUTLER, C. & RUNCORN, S. An Example of Meson Production in Lead. Nature 159, 227–228 (1947). https://doi.org/10.1038/159227a0
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DOI: https://doi.org/10.1038/159227a0
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