npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2020; 70: 35-38

Published online January 31, 2020

Copyright © New Physics: Sae Mulli.

A Simulation Study to veto the Cosmic Proton with a Polystyrene Scintillator

Jong-Kwan WOO1,2, Dong LIU1,2*

1Department of Physics, Jeju National University, Jeju 690-756, Republic of Korea

2BK21plus Clean Energy Convergence and Integration Center for Human Resources Training and Education, Jeju National University, Jeju 63243, South Korea


Received: September 16, 2019; Revised: December 11, 2019; Accepted: December 16, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Most cosmic particles around a detector in space near the Earth are protons. Sometimes, we need to reject the protons to enhance the efficiency of particle experiments. In this study, we try to find the proper thickness of a polystyrene scintillator to reject protons by using a Monte Carlo simulation tool, GEANT4, which is a common tool in high-energy experimental physics. We assume that a detector is shielded by a cylindrical shell polystyrene scintillator. Then, we inject protons, with energies from 150 MeV to 10 GeV into the polystyrene scintillator. The multiple scattering between a proton and the polystyrene molecules causes the protons to lose energy and finally stop. By calculating the energy of proton lost in the scintillator, we could obtain information on the shielding ability of polystyrene against cosmic protons.

Keywords: Proton, Cosmic ray, Polystyrene, Simulation method

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