Separation of gamma-ray and neutron events with CsI(Tl) pulse shape analysis

Y. Ashida, H. Nagata, Y. Koshio, T. Nakaya, R. Wendell

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Fast neutrons are a large background to measurements of gamma-rays emitted from excited nuclei, such that detectors that can efficiently distinguish between the two are essential. In this paper we describe the separation of gamma-rays from neutrons with the pulse shape information of the CsI(Tl) scintillator, using a fast neutron beam and several gamma-ray sources. We find that a figure of merit optimized for this separation takes on large and stable values (nearly 4) between 5 and 10 MeV of electron equivalent deposited energy, the region of most interest to the study of nuclear de-excitation gamma-rays. Accordingly, this work demonstrates the ability of CsI(Tl) scintillators to reject neutron backgrounds to gamma-ray measurements at these energies.

Original languageEnglish
Article number043H01
JournalProgress of Theoretical and Experimental Physics
Issue number4
Publication statusPublished - Apr 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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