论文标题
从不同碳接收器中的RB释放研究中提取扩散系数
Extraction of diffusion coefficients from the study of Rb release in different carbon catchers
论文作者
论文摘要
结合目标和捕捉器材料的新目标离子源系统是在放射性束社区（尤其是在Ganil）中开发的，以最大程度地减少原子到离子转换时间，以最大程度地提高原子的产量。这项研究的目的是表征在两个石墨捕捉器和两个碳纳米管捕捉器上收集的81RB的释放性能。在各种捕获器加热的温度下测量释放部分，然后与与每个捕捉器相关的分析表达式进行比较。这种比较导致提取指数因子（D0）和激活能（EACT）参与RB扩散系数的三个碳微结构。所有这些数据允许定义一个理想的捕获器，该捕获器可以由小直径的对齐碳纳米管制成，并定向，以收集目标产生的所有81RB原子，但也可以有效释放它们。
New Target-Ion Source Systems combining a target and a catcher material are developed in the radioactive beam community, in particular at GANIL, in order to maximise the yield of very short lived atoms by minimizing the atom-to-ion transformation time. The aim of this study is to characterize the release properties of 81Rb collected on two graphite catchers and two carbon nanotube catchers. The release fractions were measured at various catcher-heating temperatures and then compared to the analytical expressions relevant to each catcher. This comparison led to the extraction of the pre-exponential factor (D0) and the activation energy (Eact) involved in the diffusion coefficient of Rb for three carbon microstructures. All these data allowed to define an ideal catcher which could be made of aligned carbon nanotubes of small diameter and oriented in order to collect all the 81Rb atoms produced by the target but also to release them efficiently.
