[en] The differential neutron and proton production cross sections have been investigated for 200 MeV incident deuterons on thin and thick ⁹Be, ⁵⁶Fe and ²³⁸U targets using the LAHET code system. The examples of the deuteron beam on different target materials are analysed to determine the differences of converting the energy of the beam into the nucleons produced. Both double differential, energy and angle integrated nuclear production cross sections are presented together with the average nucleon multiplicities per incident deuteron. (K.A.)