Study on fast luminescence component induced by gamma-rays in Ce doped LiCaAlF sub(6) scintillators

We discuss the origin of the fast luminescence component induced by fast electrons generated in gamma-ray interactions in Ce doped LiCaAlF sub(6) scintillators. Although the slow luminescence component induced by Ce super(3+) emissions depends on the Ce concentration in the LiCaAlF sub(6) scintillator, the fast component is independent. The fast component is suggested to be generated in the host matrix of the LiCaAlF sub(6) crystal. From quantitative considerations based on Frank-Tamm equation, which shows the light yield of the Cherenkov radiation, the Cherenkov radiation was determined as the origin of the fast component. We, additionally, found that the slow rise time of main Ce super(3+) emissions in the Ce:LiCaAlF sub(6) scintillator plays an important role to perform the pulse shape discrimination.