用AMS-02鉴别单电荷同位素的参数化方法
A parametric approach for the identification of single-charged isotopes with AMS-02
摘要：
单电荷宇宙射线的同位素组成的测量提供了传播过程中的重要见解。然而，同位素鉴定是具有挑战性的，因为与氢的唯一稳定同位素氘相比，质子的丰度要高出一百倍。利用阿尔法磁谱仪（AMS-02）的速度和动量的精确测量，自2011年5月以来在国际空间站上运行的粒子物理探测器，我们描述了一种参数模板拟合方法，它考虑了系统的不确定性，如AMS内部粒子的碎裂，02和最终的差异之间的数据和模拟通过使用滋扰参数。通过这种方法，我们还能够评估AMS-02在质量分辨率方面的性能，表明它能够分离高达10 GeV/n的氢同位素。
英文摘要：
Measurements of the isotopic composition of single-charged cosmic rays provide important insights in the propagation processes. However, the isotopic identification is challenging due to the one hundred times greater abundance of protons when compared to deuterons, the only stable isotope of hydrogen. Taking advantage of the precise measurements of the velocity and momentum in the Alpha Magnetic Spectrometer (AMS-02), a particle physics detector operating aboard the International Space Station since May 2011, we describe a parametric template fit method, which takes into account systematic uncertainties such as the fragmentation of particles inside AMS-02 and eventual differences between data and simulation through the use of nuisance parameters. With this method we are also able to assess the AMS-02 performance in terms of mass resolution, showing that it is able to separate the isotopes of hydrogen up to 10 GeV/n.
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