Development of a new electron-RI collisiding scheme for study of unstable nuclear structure

本研究的目的是发展一种新的技术，形成一种用于电子散射实验的放射性离子靶，精确测量核电荷分布。我们称这种方法为SCRIT，这意味着一个自约束的放射性离子靶注入电子储存环的重离子被储存环中循环的电子束产生的聚焦反冲捕获。当我们施加纵向捕获势时，离子被三维捕获，在电子束流上形成浮动靶。SCRIT装置的原型安装在京都大学的电子储存环KSR中。我们尝试在SCRIT中捕获Cs离子，并成功捕获了约10^7个Cs离子，捕获寿命约为2秒。在这种情况下，电子和离子之间的碰撞光度约为5^*10^<26>cm^<-2>s^<-1>。所以我们可以确认SCRIT技术对目标非常有用。

We aim in this research development of a new technology forming a radioactive ion target for electron scattering experiment which measures precisely the nuclear charge distribution. We call this method SCRIT, which means a self-confining radioactive ion target Heavy ions injected into the electron storage ring are trapped by focusing kick given by the electron beam circulating in a storage ring. When we apply the longitudinal trapping potential additionally, ions are three-dimensionally trapped and the floating target is formed on the electron beam stream.The prototype of the SCRIT devise was installed in the KSR, which is the electron storage ring at Kyoto University. We tried to trap Cs ions in the SCRIT and succeeded in the trapping of about 10^7 Cs ions with the trapping lifetime of about 2 seconds. In this case collision luminosity between electron and ions was about 5^*10^<26> cm^<-2>s^<-1>. So we could confirm that the SCRIT technology is quit useful for the target.