The Monte Carlo calculations for the isotopes production in the UCx target (SPES project) are considered. The fragments are generated from the fission of 238U, using fast neutrons coming from a converter target (two target scheme). The neutron production yields from the converter target, as well as the energy and angular distributions from different material targets have been investigated. In all simulations, using the MCNPX code, we refer to a proton primary beam at 100 MeV energy, 1 mA, 100 kW power on the converter. The number of fissions (about 1013 fissions/s) and the production rates of neutron-rich nuclei were calculated for different converter materials.
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