Abstract
A technique based on the absolute determination of helium by a combination of vacuum fusion extraction and mass spectrometry has been used to measure the ( n, α) cross sections for nickel, iron, chromium and molybdenum samples which had been irradiated in the core of the Dounreay Fast Reactor. Particular care was taken to determine the helium contribution due to impurities in the samples. The neutron flux was calculated from activation measurements on the threshold reactions 54Fe( n, p)Mn and 58Ni( n, p) 58Co in the samples. The values obtained for the cross sections averaged over a fission neutron spectrum ( σ F ) are: nickel, 4·7(±0·6) mb; iron, 0·18(±0·04) mb; chromium, 0·17(±0·06) mb and molybdenum, 0·13(±0·03) mb.
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