MEASUREMENT OF FAST-NEUTRON ACTIVATION CROSS-SECTIONS FOR COPPER, EUROPIUM, HAFNIUM, IRON, NICKEL, SILVER, TERBIUM AND TITANIUM AT 10.0 AND14.7 MEV AND FOR THE BE(D,N) THICK-TARGET SPECTRUM

Several fast-neutron activation reactions for copper, europium, hafniu m, iron, nickel, silver, terbium and titanium that are important to fu sion energy have been investigated in three distinct neutron fields ge nerated by accelerators at Argonne National Laboratory (ANL) and Los A lamos National Laboratory (LANL), U.S.A., and Japan Atomic Energy Rese arch Institute (JAERI), Tokai, Japan. The experimental data acquired f rom this collaboration, which has been organized by the International Atomic Energy Agency, include both differential cross sections at 10.0 and 14.7 MeV and integral cross sections for the Be (d,n) thick-targe t spectrum produced by 7-MeV deuterons. Ni-58(n,p)(58g) + (CO)-C-m and Nb-93(n, 2n)Nb-92m were used as neutron fluence standards, and the U- 238(n, f) cross section was measured at 10.0 MeV to validate the exper imental techniques. Measured differential cross sections are compared with corresponding experimental data from the literature and with valu es obtained from nuclear model calculations and evaluations. Measured integral cross sections are compared with some earlier experimental re sults from ANL and with calculated values based on available different ial cross-section excitation functions and various representations of the Be(d, n) neutron spectrum. Reasonably good agreement is observed i n many of these comparisons.