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A new type of neutron detector, named Stack Structure Solid organic Scintillator (S 4 ), consisting of multi-layer plastic scintillators with capability to suppress low-energy γ rays under high-counting rate has been constructed and tested. To achieve n-γ discrimination, we exploit the difference in the ranges of the secondary charged particles produced by the interactions of neutrons and γ rays in the scintillator material. The thickness of a plastic scintillator layer was determined based on the results of Monte Carlo simulations using the Geant4 toolkit. With layer thicknesses of 5 mm, we have achieved a good separation between neutrons and γ rays at 5 MeV ee threshold setting.We have also determined the detection efficiencies using monoenergetic neutrons at two energies produced by the d +d → n+ 3 He reaction. The results agree well with the Geant4 simulations implementing the Liège Intranuclear Cascade hadronic model (INCL++) and the high-precision

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