The neutron lifetime τₙ has been measured by counting decay protons stored in a Penning trap whose magnetic axis coincided with a neutron-beam axis. The result of the measurement is τₙ=893.6±{}5.3 s, which agrees well with the value predicted by precise measurements of the {β}-decay asymmetry parameter A and the standard model.
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Byrne et al. (1990) studied this question.
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