Evaluation and validation of d–Li cross section data for the IFMIF neutron source term simulation

A completely new evaluation of the d + 6,7Li interaction cross sections up to 50 MeV has been performed applying a new methodology which takes into account compound nucleus reactions, pre-equilibrium processes, stripping and direct interactions. The evaluated d + 6,7Li cross section data were prepared in the laboratory frame, stored in standard ENDF-6 data format and processed by the NJOY code system. A series of benchmark calculations was performed with the McDeLicious code to test the new data evaluations against experimental thick and thin lithium target neutron yield data up to 40 MeV deuteron energy. It was shown that the new d + 6,7Li cross section data can well reproduce both the thick target neutron yields and differential neutron emission cross sections. Thus there is a clear improvement of the prediction accuracy for the IFMIF neutron source term simulation with the new d + 6,7Li cross section data evaluations.