Report on the performance of a dual-mode inorganic scintillator TLYC

TLYC (Tl$_{\mathrm{2}}^{\mathrm{6}}$LiYCl$_{\mathrm{6}}$, $\ge $ 95{\%} $^{\mathrm{6}}$Li, 75.8{\%} $^{\mathrm{35}}$Cl, $\rho \quad =$ 4.5 g/cm$^{\mathrm{3}})$ is a dual-mode inorganic scintillator with the capability to detect both neutrons and $\gamma $ rays with good energy resolution. The $\gamma $-ray energy resolution better than 4{\%} was reported for a crystal size of 1'' x 1''. Unlike most neutron detectors which depend on the time-of-flight technique to determine the energy, TLYC can be sued to measure the neutron energy directly through charged-particle creating reactions on the constituent isotopes. A resolution better than 10{\%} for fast neutrons with energies up to 8 MeV was obtained for the same class of scintillator, CLYC (Cs$_{\mathrm{2}}$LiYCl$_{\mathrm{6}})$, where cesium is replaced by thallium for the molecular formula of TLYC. It opens the door for many applications. A crystal size of 1'' x 1'' is acquired recently and an extensive test is carried out using a $^{\mathrm{252}}$Cf PPAC to characterize the pulse-shape discrimination between neutrons and $\gamma $ rays as well as the energy and timing resolution. The prompt fission neutron and $\gamma $-ray spectra can be measured by TLYC in coincidence with the detection of fission fragments by PPAC. The detector response for both neutrons and $\gamma $ rays can be measured simultaneously using this coincident technique. The characterization of those performances will be presented.