用AMS实验的RICH探测器分离同位素
Isotope separation with the RICH detector of the AMS Experiment
摘要：
将于2008年安装在国际空间站上的阿尔法磁谱仪是一个宇宙射线探测器，有几个子系统，其中之一是近距离聚焦环成像切伦科夫探测器。该探测器将配备一个双辐射器（气凝胶+NaF）、一个侧面圆锥镜和一个由680个光电倍增管和光导制成的探测平面，能够精确测量粒子电荷和速度。将速度测量与AMS Tracker的粒子刚性数据相结合，可以获得粒子质量的测量结果，从而可以分离同位素。基于离子束测试中测得的实际性能，对RICH探测器进行了蒙特卡罗模拟，以评估同位素分离能力。给出了H（Z=1）、He（Z=2）和Be（Z=4）三种元素的计算结果。
英文摘要：
The Alpha Magnetic Spectrometer (AMS), to be installed on the International Space Station (ISS) in 2008, is a cosmic ray detector with several subsystems, one of which is a proximity focusing Ring Imaging Cherenkov (RICH) detector. This detector will be equipped with a dual radiator (aerogel+NaF), a lateral conical mirror and a detection plane made of 680 photomultipliers and light guides, enabling precise measurements of particle electric charge and velocity. Combining velocity measurements with data on particle rigidity from the AMS Tracker it is possible to obtain a measurement for particle mass, allowing the separation of isotopes. A Monte Carlo simulation of the RICH detector, based on realistic properties measured at ion beam tests, was performed to evaluate isotope separation capabilities. Results for three elements -- H (Z=1), He (Z=2) and Be (Z=4) -- are presented.
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