Behaviour of Ions of Unstable Nuclei in Superfluid Helium

人们早就知道，如果将正离子引入超流氦中，则会对周围的氦原子施加电致伸缩，并获得氦质量的50 - 100倍的有效质量。这种围绕杂质离子的氦原子带电聚集体被称为雪球。将高能短寿命β-和α-放射性离子束作为杂质离子引入超流氦中，并通过β-和α-粒子检测放射性离子周围形成的雪球。我们的兴趣是利用^6He和^8He以及许多其他短寿命的β和α活性核来研究与杂质离子有关的输运现象以及杂质离子与超流氦中基本激发态的相互作用。在德国达姆施塔特新建的GSI加速器综合体SIS-ESR中，正在探讨实施一个实验项目的可能性：用放射性核束研究低温下的凝聚物质。

It has long been known that a positive ion, if introduced in superfluid helium, exerts electrostriction on helium atoms surrounding it and acquires effective mass of 50 - 100 times the helium mass. Such a charged aggregate of helium atoms around an impurity ion is referred to as a snowball. High-energy beam of short-lived beta- and alpha-radioactive ions are introduced into superfluid helium as impurity ions and the snowballs formed around the radioactive ions are detected by the beta- and alpha-particles. Our interest is the use of ^6He and ^8He and many other short-lived beta- and alpha-active nuclei to study transport phenomena related to impurity ions and interactions of impurity ions with basic excitations in superfluid helium. Possibility has been pursued of carrying out an experimental project; STUDY OF CONDENSED MATTER AT LOW TEMPERATURE WITH RADIOACTIVE NUCLEAR BEAMS, at the newly constructed accelerator complex SIS-ESR of GSI at Darmstadt, Germany.