Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

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LIU Jun-Hui, LI Dao-Wu, ZHANG Zhi-Ming, WANG Bao-Yi, ZHANG Tian-Bao, HAO Jia and WEI Long. Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy[J]. Chinese Physics C, 2012, 36(4): 380-383. doi: 10.1088/1674-1137/36/4/016
LIU Jun-Hui, LI Dao-Wu, ZHANG Zhi-Ming, WANG Bao-Yi, ZHANG Tian-Bao, HAO Jia and WEI Long. Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy[J]. Chinese Physics C, 2012, 36(4): 380-383.  doi: 10.1088/1674-1137/36/4/016 shu
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Received: 2011-06-07
Revised: 2011-11-14
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Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

Abstract: A LaBr3:Ce scintillator has a high light output (~60000 p.e/MeV) and a short decay constant (<25 ns), which makes it good for time spectrometry. Compared with a BaF2 scintillator, it can bear a much higher count rate, and can be coupled to photomultipliers without using a quartz window. In this work, a positron annihilation lifetime spectrometer (PALS) consisting of two bulks of φ25 mm×25 mm LaBr3:Ce scintillator coupled to two XP20D0 photomultipliers, respectively, was built. A time resolution of FWHM=206 ps was measured for the PALS with a 60Co source at the energy window for 22Na. With this spectrometer, a reasonable lifetime value τ=221±4 ps in a pure Si sample is obtained, which means that the utilization of LaBr3:Ce as the detector for a PALS is feasible.

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