Extension of applicable neutron energy of DARWIN upto 1 GeV

Satoh, Daiki   ; Sato, Tatsuhiko   ; Endo, Akira   ; Matsufuji, Naruhiro*; Takada, Masashi*

In order to assess the neutron dose with DARWIN, a set of reliable response functions for neutron is required. Although the response function for neutron has been already determined below 100 MeV, the evaluation method is not established for high-energy neutrons. This is a reason to restrict the applicable energy of DARWIN at 100 MeV. To extend the applicable energy, we developed SCINFUL-QMD code which is capable of calculating the response function up to a few GeV. To verify the SCINFUL-QMD, response functions above 100 MeV have been measured at the HIMAC of National institute of Radiological Sciences. Neutrons were produced by bombardment 800 MeV/u Si and 400 MeV/u C ions with a graphite target. The experimental results showed a good agreement with predictions of SCINFUL-QMD. The G-function was evaluated up to 1 GeV based on the calculation of SCINFUL-QMD.