An experimental particle physicist who, with Bruno Rossi, compared the decay of cosmic-ray muons selected by their penetrating power. The less energetic group decayed more rapidly than the more penetrating group, consistent with time dilation. Using absorbers to separate momentum ranges turned naturally occurring particles into a test of the rate of moving clocks.[ref]
Variation of the Rate of Decay of Mesotrons with Momentum by Bruno Rossi and David B. Hall. Abstract: lead-range groups and momentum-dependent decay rate
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