Abstract
Precision measurements of the cross sections of the (n, 2n) reactions to produce 44mSc, 88Y, 89Zr, 92Nb, 150Eu(35y), 168Tm, 174m+gLu and 196Au were made for a range of neutron energies from 13.7 to 15.0 MeV. The samples were irradiated at various positions on the surface of a 20 cm radius sphere centered at the 2H– 3H neutron source. This allowed a range of neutron energies to be obtained with good energy resolution. The 27Al(n, α) 24Na reaction was used to monitor the neutron fluence in the target samples. Particular attention was given to the accurate measurement of the (n, 2n) products, using calibrated Ge(Li) and NaI(Tl) detectors. An uncertainty of about ±5% is assigned to the results, except those for 150Eu and 174Lu, which have an additional uncertainty in their decay schemes.
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