Abstract
CLOUD-CHAMBER photographs of associated penetrating particles produced in air and lead have already been obtained by various observers1–5. In the course of taking photographs of cosmic rays by a randomly operated cloud-chamber placed in a magnetic field of 1500 gauss with a lead absorber 1.5 cm. thick at the centre of the chamber, photographs have been obtained showing pairs of penetrating particles diverging from a point in the field coils. One such photograph is reproduced.
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BASU, C. Meson Production in Copper. Nature 158, 379–380 (1946). https://doi.org/10.1038/158379c0
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DOI: https://doi.org/10.1038/158379c0
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