INTERACTION OF BETA-RADIOACTIVE ATOMS IN LIQUID HELIUM

重离子反应产生的放射性he、Li和b同位素形成快放射性核豆，并引入液氦。大多数引入的离子被中和，但仍有一些保持为单电荷离子。它们的空间分布随时间而变化。固体-四射线探测器和位置敏感-射线探测器使我们能够识别和跟踪空间分布。利用探测器研究了杂质离子与玻色缩合水的相互作用。在液氦温度下工作的离子种植固体探测器安装在低温恒温器中，只有在上述两种检测方法的控制下，杂质离子与超流氦相互作用的研究才成为可能。检测效率大大超过了传统的电荷测量方法。含1.2 K的低温恒温器。从大阪大学RCNP环形回旋加速器获得的重离子束被引入二次束（EN）过程，形成放射性核豆。用Li和b研究了离子和中和原子的行为，首次证明了超流氦中He原子微团簇中原子核自旋极化是维持的。核子、低温和凝聚态（比如团簇）物理的研究迈出了巨大的第一步。

Radioactive he, Li andB isotopes produced by heavy-ion reactions were ofrmed into fast radioactive nuclear beans and were introduced into liquid helium. Most of the introduced ions are nutralized but still some remain as singly-charged ions. Their spatial distribution changes with time. Solid-state alpha-and teta-ray detectors and pasition sensitive beta-ray detectors enabled us to indentify and trace the spatial distributions. With use of detectors interactions of impurity ions and Bose condensation waer studied. Ion planted solid state detectors working at liquid He temperature were mounted in a cryostat and the study of interaction of impurity ions with superfluid helium became passible only after the ontroduction of the two detection methods stated above. The detection efficiency largely exceeded that of the conventional electric aharge measurements. A cryostat incorporating of 1.2 K.Heavy-ion beams obtained from the ring cyclotron of RCNP, Osaka Unversity were led to the secondary beam (EN) course and radioactive nuclear beans were formed. The behavior of ions and neutralized atoms was studied with use of Li and B.Nuclear spin polarization was proved for the first time to ve maintained in a micro-cluster of He atoms in superfluid helium. A huge first stop has been trodden for the study of nuclear, low-temperature and condensed-matter (say cluster) Physices.