M. Danang Birowosuto, Pieter Dorenbos, Johan T. M. de Haas, Carel W. E. van Eijk, Karl W. Krämer and H. U. Güdel
Li-Based Thermal Neutron Scintillator Research; Rb₂LiYBr₆ : Ce³⁺ and Other Elpasolites
IEEE Trans. Nucl. Sci. 55, 1152-1155 (2008)                 

Abstract: We investigated gamma- and neutron-scintillation properties of A₂LiLnX₆:Ce³⁺ (A=Cs, Rb, K, Na, Li; Ln=La, Y, Lu, Sc; X=Br, I) with the aim to develop new scintillators with high neutron detection efficiencies. Among the investigated thermal neutron scintillators, Rb₂LiYBr₆:Ce³⁺ shows an excellent neutron peak resolution of 3.6%. This is the best neutron peak resolution ever reported. Together with the large a/b ratio of 0.74, Rb₂LiYBr₆:Ce³⁺ offers the possibility of excellent neutron/g discrimination. The highest thermal neutron scintillation light yield of 83000 photons/neutron is also reported for Rb₂LiYBr₆:Ce³⁺.