Cecil Frank Powell (1903–1969)

Cecil Frank Powell developed nuclear emulsion methods for studying cosmic rays. A charged particle leaves a microscopic sequence of developed grains; track length, scattering and grain density can then constrain its energy and mass. His work with colleagues on connected stopping tracks helped identify the pion and its decay into a muon. The method combined long exposures with repeated microscope measurements, turning rare cosmic events into quantitative evidence.^[ref]

A physicist.^[ref]

Figure 1.
Portrait of Cecil Frank Powell
. Source.

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Work by Cecil Frank Powell

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