Temporal Response of Ultrafast Inorganic Scintillators for Future HEP Applications

Future high energy physics experiments require ultrafast inorganic scintillators. Our previous investigation measured temporal response for various inorganic scintillators to pico-second X-rays at APS of ANL. In this paper we report temporal response of ultrafast inorganic scintillators to 511 keV γ-rays and 5.49 MeV alpha-rays from a ²² Na source and an ²⁴¹ Am source respectively by using an MCP-PMT based test bench. 0.5 and 1.1 ns decay time is observed from BaF 2 and Lu 2 O 3 :Yb respectively. The BaF 2 result is also compared to 1.2 ns decay time observed at APS. Temporal response of other ultrafast inorganic scintillators, such as ZnO:Ga, Ga 2 O 3 , YAP:Yb, YAG:Yb and Cs 2 ZnCl 4 etc., are also reported.