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Cecil Frank Powell (1903-1969), British physicist and Nobel laureate. Powell was educated at Cambridge University, and worked there and in Bristol. Powell was awarded the 1950 Nobel Prize for Physics. The Nobel was awarded for Powell's photographic method of studying particle physics experiments and his work on mesons. In the 1930s, Powell started to use photographic plates to record the passage of charged particles. The tracks may be studied under a microscope, and Powell used them to estimate the mass, charge and energy of the particles concerned. This work led to his discovery of the pi-meson (pion) in 1947, predicted by Yukawa in 1935.
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