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Fast Neutron Detection With Cs2LiYCl6

Author:
Glodo, Jarek  Shirwadkar, Urmila  Hawrami, Rastgo  Achtzehn, Tobias  Andrews, H. Robert  Clifford, E. Ted H.  Ing, Harry  Kovaltchouk, Vitaly D.  Smith, Martin B.  Shah, Kanai S.  


Journal:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE


Issue Date:
2013


Abstract(summary):

This paper discusses our initial investigation of fast neutron detection with a Cs2LiYCl6 (CLYC) scintillator. CLYC has been already developed for dual mode detectors (thermal neutrons and gamma rays). Described are results collected under mono-energetic irradiation from a Van de Graaff generator and a continuous irradiation from a Cf-252 source. There are two reactions in which fast neutrons are captured Cl-35(n, p)S-35 and Li-6(n, t)alpha; both have been observed. They produce a proton and a pair of alpha/t particles, respectively. The response to mono-energetic fast neutrons due to the Cl-35(n, p) reaction produces a peak and due to the Li-6(n, t) reaction a continuum in the energy spectra. The relation between the peak (continuum) position and the excitation energy is linear within evaluated energy range. This allows for fast neutron spectroscopy. The alpha/beta ratios for both reactions were found to be different and somewhat dependent on the excitation energy. The decay times under the proton excitation slightly differ from these under the alpha/t excitation, while both are significantly different from the gamma ray excited curves. This is important for pulse shape discrimination. Using continuous excitation from Cf-252 initial efficiency was estimated for the Cl-35(n, p) reaction. For a 1-inch right cylinder crystal the measured intrinsic efficiency is at least 0.06%, while calculated is 0.5%. The discrepancy is due to experimental inaccuracies. The relative detection efficiency scales linearly with the volume. A convolution of the theoretical Cf-252 fast neutron distribution and the Cl-35(n, p) cross-section curve was found to match the experimental data.


Page:
864---870


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