POPSCI - 1.23.12 by Clay Dillow
The experiments would require bottling neutrons in an ultracold state, a process that physicists have been performing for years to measure how quickly neutrons decay. These bottles--made of ordinary matter imbued with magnetic fields--are able to trap these super-cooled neutrons and keep them moving slowly enough that they can be observed. Physicists can measure the rate at which these trapped neutrons strike the walls of the bottle and how quickly this rate declines as the neutrons decay.
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