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Multi-layer plastic scintillation detector for intermediate- and high-energy neutrons with n-γ discrimination capability

  • L. Yu*
  • , S. Terashima
  • , H. J. Ong
  • , P. Y. Chan
  • , I. Tanihata
  • , C. Iwamoto
  • , D. T. Tran
  • , A. Tamii
  • , N. Aoi
  • , H. Fujioka
  • , G. Gey
  • , H. Sakaguchi
  • , A. Sakaue
  • , B. H. Sun
  • , T. L. Tang
  • , T. F. Wang
  • , Y. N. Watanabe
  • , G. X. Zhang
  • *Corresponding author for this work
  • Beihang University
  • The University of Osaka
  • Vietnamese Academy of Science and Technology
  • Kyoto University
  • The University of Tokyo

Research output: Contribution to journalArticlepeer-review

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).

Keywords

  • Monte Carlo simulation
  • Multi-layer plastic scintillators
  • Range of secondary particle
  • n-γ discrimination under high-counting rate

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