Abstract
A new type of neutron detector, named Stack Structure Solid organic Scintillator (S4), 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 MeVee threshold setting. We have also determined the detection efficiencies using monoenergetic neutrons at two energies produced by the d+d→n+3He reaction. The results agree well with the Geant4 simulations implementing the Liège Intranuclear Cascade hadronic model (INCL++) and the high-precision model of low-energy neutron interactions (NeutronHP).
| Original language | English |
|---|---|
| Pages (from-to) | 118-128 |
| Number of pages | 11 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| Volume | 866 |
| DOIs | |
| State | Published - 11 Sep 2017 |
Keywords
- Monte Carlo simulation
- Multi-layer plastic scintillators
- Range of secondary particle
- n-γ discrimination under high-counting rate
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