金属箔表面热中和Fr离子用于放射性同位素的磁光俘获
Thermal surface neutralization of Fr ions with metal foils for magneto-optical trapping of radioisotopes
摘要：
我们调查的中和过程（特别是热表面中和），这是所需的磁光捕获的放射性原子。首先概述了各种中和方法：用于聚变反应堆的中性束注入，半导体加工中的中性原子注入，以及在加速器中产生放射性中性原子。我们专注于热表面中和，产生中性原子的热能范围内的激光冷却。实验进行了与钇，钆，锆箔，以中和<$和铷离子的磁光捕获。结果再次证实钇箔是良好的中和剂（即，它具有中性释放效率（$>65\%$）。此外，在1350 K下，使用钇箔时的释放分数超过75%，这大于其他箔的释放分数。这一重新确认是重要的，因为很少有以前的研究集中在热表面中和。此外，结果表明，中和效率受到实验过程本身的强烈影响。
英文摘要：
We investigate neutralization processes (especially thermal surface neutralization), which are required for the magneto-optical trapping of radioactive atoms. A variety of neutralization methods are first summarized: neutral beam injection for fusion reactors, neutral atom implantation in semiconductor processing, and the production of radioactive neutral atoms in accelerators. We focus on thermal surface neutralization, which produces neutral atoms in the thermal energy range for laser cooling. The experiments were carried out with yttrium, gadolinium, and zirconium foils to neutralize francium and rubidium ions for magneto-optical trapping. The results reconfirm that yttrium foil is a good neutralizer (i.e., it has a neutral release efficiency $>65\%$). In addition, the release fraction when using yttrium foil exceeds 75\% at 1350 K, which is greater than the release fraction for the other foils. This reconfirmation is important because few previous studies have focused on thermal surface neutralization. Moreover, the results show that the neutralization efficiency is strongly influenced by the experimental process itself.
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