The capture cross section of slow neutrons by protons has been measured by following the decay of neutrons from a pulsed source in water. The decay was measured by detecting the capture γ-rays with a liquid scintillator. The observed average life in water was 203.3 ± 2.6 μsec corresponding to a capture cross section of 0.335 ± 0.004 barns at a velocity of 2200 metres/sec.
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Meads et al. (1956) studied this question.
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