Measurement of deuteron induced thick target neutron yields at 5 MeV and 9 MeV

The double differential thick target neutron yields from 5 MeV and 9 MeV deuteron incidence were measured at the Kyushu University Tandem Accelerator Laboratory. A copper, a titanium and a niobium foils which are thick enough for a deuteron to stop in the foils were placed at the center of a vacuum chamber. An NE213 liquid organic scintillator was employed to detect neutrons emitted from targets and placed at 9 directions from 0deg to 140deg. To consider the contribution of scattered neutrons from the floor, we also measured neutron yields with an iron shadow bar located in front of the scintillator. Because incident deuteron beam was not pulsed and the Time-of-Flight method was not applied, the energy spectrum was derived from unfolding the light output spectrum using the FORIST code. The detection efficiency was calculated with the SCINFUL-QMD code. The experimental results were compared with the calculation data of the TALYS and PHITS2 codes and moving source model calculation, and it turned out that the calculation data does not reproduce the experimental ones satisfactorily. (author)