The asset of ultra-fast digitizers for positron-lifetime spectroscopy
The asset of ultra-fast digitizers for positron-lifetime spectroscopy
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DOI：
10.1016/j.nima.2004.09.031
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发表时间：
2005-02-21
影响因子：
1.4
通讯作者：
Janotová, J
中科院分区：
文献类型：
--
作者：
Becvár, F;Cízek, J;Janotová, J
本文详细介绍了由两个BaF_2闪烁探测器和两个8位4GS s（-1）数字化器组成的主从式正电子寿命谱仪。我们报告的结果比较测试测量的寿命的正电子湮没在α-Fe使用这种设置和设置所形成的同一对探测器与模拟电子模块一起工作。这些测量的数据首次表明，用快速数字化仪取代模拟电子链导致正电子寿命测量精度的大幅提高。在符合计数率与快-快装置相当或几乎相等的情况下，用所述谱仪获得了131-136 ps的记录时间分辨率。(C)2004 Elsevier B. V.保留所有权利。
A spectrometer for positron-lifetime measurements assembled from two BaF2 scintillation detectors and two 8-bit, 4GS s(-1) digitizes in a master-slave configuration is described in detail. We report the results of comparative testing measurements of the lifetime of positrons annihilating in alpha-Fe using this setup and a setup formed by the same pair of detectors working in conjunction with analog electronics modules. The data from these measurements demonstrate for the first time that replacing the analog electronics chain by fast digitizers leads to a substantial improvement of the precision in positron-lifetime measurements. A record timing resolution of 131-136 ps has been achieved with the described spectrometer at coincidence counting rate comparable or virtually equal to that obtained with the fast-fast setup. (C) 2004 Elsevier B.V. All rights reserved.