Rossi-Hall experiment

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[An example of a muon decay.]
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[An example of a muon decay.]

Performed in 1941 at Echo Lake in Colorado, the Rossi-Hall experiment measured the relativistic decay of mesotrons (mesons, they happened to be measuring muon decay) and found it to be in good agreement with the predictions of Special Relativity. A value for the muon lifetime was given as To=2.3 +/- .2 microseconds, which was later refined in 1943 by Rossi and Nereson to To=2.15 +/-.07 microseconds, which was still in excellent agreement with Relativity.

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