3 years ago

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

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

Fast neutrons are a large background to measurements of gamma-rays emitted from excited nuclei, such that detectors which 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~${\rm MeV_{ee}}$ of 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.

Publisher URL: http://arxiv.org/abs/1801.04753

DOI: arXiv:1801.04753v1

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