期刊
出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2004.09.031
关键词
positron annihilation in condensed matter; positron-lifetime spectroscopy; BaF2 scintillators; fast digitizers; timing resolution power; photomultipliers
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据