The capture cross section of natural boron for slow neutrons has been measured by a dynamic method, in which the decay constant of neutrons in a water tank was plotted against the concentration of added borax. Samples were compared with a standard boron oxide in GLEEP at the Atomic Energy Research Establishment, Harwell. The result is quoted as σ B =760±3 barns for the A.E.R.E. sample of natural boron oxide.
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Collie et al. (1956) studied this question.
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