Abstract
Measurements have been made of the 63Cu(n,2n) 62Cu and 65Cu(n,2n) 64Cu cross sections. Separated isotope targets were irradiated with 14.8 MeV neutrons and the resulting 62Cu and 64Cu activities were measured using both 4πβ-γ coincidence counting and by counting in coincidence the annihilation radiation produced following the β +-decay of 62Cu and 64Cu. The variation in the neutron flux and the neutron energy were measured during each single irradiation. Good agreement was obtained for the cross-section values using the two methods. However, the standard deviation of the mean of the 65Cu(n,2n) 64Cu cross-section measurements was significantly greater when the 4πβ-γ coincidence method was used. The measurements were made relative to the 56Fe(n,p) 56Mn cross section. Values of 549 ± 11 and 968 ± 20 mbarn were obtained using a value of 108.5 mbarn for the Fe cross section at 14.8 MeV.
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