Study of neutron detection efficiencies for liquid organic scintillator upto 3 GeV

The Monte Carlo code, designated SCINFUL-QMD, has been developed to calcula te neutron detection efficiency up to 3 GeV for liquid organic scintillator s such as NE-213. The existing Monte Carlo code, SCINFUL, is known to repro duce a response function and detection efficiency at incident neutron energ ies below 80 MeV We incorporate the quantum molecular dynamics plus statist ical decay model (QMD + SDM) into SCINFUL to extend the upper limit of inci dent neutron energy to 3 GeV The tabulated cross sections adopted in SCINFU L are extrapolated up to 150 MeV, and the (QMD + SDM) method is used above 150 MeV The results of SCINFUL-QMD are compared with the experimental data and thos e of CECIL, another computation code. At energies below 20 MeV, the results of SCINFUL-QMD agree with the experimental data. At higher energies, this code gives smaller values than those of the experimental data. SCINFUL-QMD exhibits an increase in detection efficiency above 300 MeV This result is a chieved by taking charged pion production into account.