Using a LaBr<SUB>3</SUB>:Ce scintillator for positron annihilation lifetime spectroscopy

LIU Jun-Hui; LI Dao-Wu; ZHANG Zhi-Ming; WANG Bao-Yi; ZHANG Tian-Bao; HAO Jia; WEI Long

doi:10.1088/1674-1137/36/4/016

Chinese Physics C> 2012, Vol. 36> Issue(4) : 380-383 DOI: 10.1088/1674-1137/36/4/016

Using a LaBr₃:Ce scintillator for positron annihilation lifetime spectroscopy

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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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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

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Received: 2011-06-07
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Using a LaBr₃:Ce scintillator for positron annihilation lifetime spectroscopy

Received Date: 2011-06-07

Accepted Date: 2011-11-14

Available Online: 2012-04-05

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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Using a LaBr₃:Ce scintillator for positron annihilation lifetime spectroscopy

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Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

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Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

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Using a LaBr₃:Ce scintillator for positron annihilation lifetime spectroscopy

Using a LaBr₃:Ce scintillator for positron annihilation lifetime spectroscopy