Collection and Transport of Radioactive Ions in Superfluid Helium

本课题的目的是研究超流氦中离子和原子的特殊行为。建立了低温恒温系统。新的测试设备使我们能够将快速离子引入液氦并将其输送到液氦中。利用该系统对形成的雪球的核心离子进行了核磁共振分析和核辐射检测。通过对系统的最终改进，温度降至近1.1K。温度和机械强度的稳定性是需要保证的主要因素。我们目前感到满意的是，这样一个制度已经完成。正在进行的实验是关于收集和捕获，以实现光谱学的最终目标。该系统在RCNP和RIKEN使用。该探测器系统已在京都大学串联实验室进行了测试。该研究已在国内外的会议和研讨会上进行了介绍。中性组分的特殊行为有待解决，我们认为，解决问题的关键就在我们手中。该研究将进一步发展到超流氦中原子和离子的运动。

The objectives of this project are studies on particular behavior of ions and atoms in superfluid helium. A cryostat system was built. The new test apparatus enables us to introduce and transport fast ions into liquid helium. Application of NMR on the core ions of the formed snowballs and detection of nuclear radiation are carried out with this system.Through the eventual improvements in the system the temperature is lowered down to almost 1.1K.The stability in temperature and mechanical strength is the main factors to be assured. We are satisfied for the moment that such a system has been completed. The experiments being carried out are on the collection and trapping to make the final objectives of the spectroscopy available. The system is used at RCNP and RIKEN.The detector system has been tested at the Kyoto University Tandem Laboratory.The investigation has been introduced at the conferences and workshops at overseas and in Japan. The peculiar behaviors of the neutral components are to be solved, and the key to it, we think, is at our hands.The study will be further developed to the movement of atoms and ions in superfluid helium.