Fast timing study of a CeBr₃ crystal: Time resolution below 120 ps at ⁶⁰Co energies

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• 作者：L.M. Fraile ; ^{fraile@nuc2.fis.ucm.es} ; ^{Luis.Fraile@cern.ch} ; ; H. Mach¹ ; ; V. Vedia ; B. Olaizola ; V. Paziy ; E. Picado ; J.M. Udí ; as
• 关键词：Fast timing ; CeBr3 ; Inorganic scintillators ; Time resolution ; Fast photomultiplier tubes ; Photonis XP20D0 ; Hamamatsu R9779
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2013
• 出版时间：11 February, 2013
• 年：2013
• 卷：701
• 期：Complete
• 页码：235-242
• 全文大小：438 K

文摘

We report on the time response of a novel inorganic scintillator, CeBr₃. The measurements were performed using a cylindrical crystal of 1-in. in height and 1-in. in diameter at ²²Na and ⁶⁰Co photon energies. The time response was measured against a fast reference BaF₂ detector. Hamamatsu R9779 and Photonis XP20D0 fast photomultipliers (PMTs) were used. The PMT bias voltages and Constant Fraction Discriminator settings were optimized with respect to the timing resolution. The Full Width at Half Maximum (FWHM) time resolution for an individual CeBr₃ crystal coupled to Hamamatsu PMT is found here to be as low as 119 ps at ⁶⁰Co energies, which is comparable to the resolution of 107 ps reported for LaBr₃(Ce). For 511 keV photons the measured FWHM time resolution for CeBr₃ coupled to the Hamamatsu PMT is 164 ps.