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Alpha particles in a cloud chamber

Alpha particles in a cloud chamber

A132/0028

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

In a series of classic cloud chamber experiments in the late 1920s, English physicist Patrick Blackett obtained clear evidence of how alpha particles scatter from atomic nuclei of different masses. In this pair of pictures, alpha particles stream upwards through the chamber. One in each picture scatters a nucleus in the helium gas filling the chamber. The two particles move off at a 90-degree angle in each case, revealing that they have the same mass - alpha particles are helium nuclei.

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Model release not required. Property release not required.

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