Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

被引：7

作者：

Liu Jun-Hui ^{[1
,2
]}

Li Dao-Wu ^{[1
,2
]}

Zhang Zhi-Ming ^{[1
,2
]}

Wang Bao-Yi ^{[1
,2
]}

Zhang Tian-Bao ^{[1
,2
]}

Hao Jia ^{[3
]}

Wei Long ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Anal Tech, Beijing 100049, Peoples R China

[2] Beijing Engn Res Ctr Radiog Tech & Equipment, Beijing 100049, Peoples R China

[3] Beijing Huakailong Elect Co Ltd, Beijing 100085, Peoples R China

来源：

CHINESE PHYSICS C | 2012年 / 36卷 / 04期

基金：

中国国家自然科学基金;

关键词：

PALS; LaBr3:Ce;

D O I：

10.1088/1674-1137/36/4/016

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A LaBr3:Ce scintillator has a high light output (similar to 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 phi 25 mmx 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 Co-60 source at the energy window for Na-22. With this spectrometer, a reasonable lifetime value tau=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.

引用

页码：380 / 383

页数：4

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