| The research paper is based on accelerator driven system (ADS). Tt introduced thedetection mechanism and related physical properties of the liquid scintillator detectors. In thiswork, the distribution characteristics of the spallation neutron source of ADS system arestudied, and the energy spectrum and energy deposition of secondary particles produced byhigh-energy neutrons interacting with NE213liquid scintillator are studied systematically.And the light output of liquid scintillator is also studied. According to the simulation results ofthe FLUKA Monte Carlo software, the dependence of absolute neutron detection efficiencyon neutron energy, neutron incident position, detection threshold and scintillator size havebeen discussed. This article provides some reference basis.for the detection of dozens of MeVto1GeV high-energy neutron.Double-differential cross sections of high-energy protons interaction with thick Al, Feand Pb target have been simulation by means of FLUKA Monte Carlo program, the accuracyof the code was experimentally confirmed. The energy range and spatial distribution of theADS spallation neutron source have been determined. A simulation of secondary particlesenergy spectrum produced by collimating mono-energetic neutron sources interacting withNE213liquid scintillator has been carried out. The main luminous position of scintillator andthe characteristics of secondary particle energy deposition are also determined. It verified thethe main types of secondary particles to consideration and the influence of detector size on theneutron detection. In this paper, by setting card related parameters in FLUKA, combined withthe function of particle deposition energy transform to light output of Birks formula, the lightoutput of high-energy neutron, which is produced in the NE213scintillator, is simulated byFLUKA. The light output produced by secondary particles has been contrasted. Thesimulation results were compared with the experimental value to verify the reliability ofFLUKA used to simulate study of the scintillation detector, the main secondary particle typeneed to be considered in the light output simulation is summed up.Combining the ROOT data processing tool, this work studied a series of factorsinfluencing neutron detection efficiency, obtained the regular variation curve of detectionefficiency as the change of neutron energy for various sizes of NE213liquid scintillatordetectors, and analyzes the influence of the main types of secondary particles in various energy segment. The research paper given the curve of neutron detection efficiency alongwith the change of the position of neutron radiated to the front of the detector surface,determine the existence of critical incident location. The influence of length and diameter ofscintillator for detection efficiency was studied in a series of energy neutron, providesreference for the optimization selection of scintillation size. It esearched the the influence ofthe setting of detection threshold on detection efficiency for a range of sizes of probe, and thesensitive threshold range is obtained. This paper provided the references for the further studyof detection of high-energy neutron, especially for the study of neutron which energy up to1GeV. |
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