Weak nuclear force is less weak: At the Paul Scherrer Institute in Switzerland a dedicated proton beam was used to create muons amid collisions with a graphite target.
Researchers then gathered a fine spray of muons, directed them and stopped them in their own metal target which was surrounded by a detector that could track the muons' demise. The decay of over 2 trillion muons provided the best yet value for the average muon lifetime. It comes out to 2.1969803 microseconds.
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