= David B. Hall
{c}
{tag=Physicist}
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.<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]{ref}
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