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Ion/atom trap with use of superfluid helium

使用超流氦的离子/原子陷阱

基本信息

批准号：
07454052
负责人：
SHIMODA Tadashi
金额：
$ 5.18万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454052/
关键词：
supefluid helium ion atom trap spin polarization laser optical pumping beta-elayd neutron spin and parity Gamow-Teller strength 氷球粒子 snowball イオントラップ核スピンの保持スピン偏極度核磁気共鳴

项目摘要

Alian ions in supefluid helium form a micro-clusters of helium atoms due to electrostriction. The structure of the cluster is thought to be highly symmetric and thus spin orientation of the core ion may be preserved. This feature is quite attractive for application to spectroscopic studies of unstable nuclei far from stability. We investigated feasibility and applicability of superfulid helium as an ion-trap.The preservation of spin polarization was ensured by using spin-polarized 12B beams. The formation probability of the micro-cluster in which the implanted ion preserves its charge was as high as 20 % of the implated ions. Spatial manupilation of the cluster under the electrostatic field was performed. Next step is a boostup of polarization by using laser optical pumping. Dificulties of the pumping have been investigated.As an application to the spectroscopic studies, beta-delayd neutron dacay of 17B has been observed. By measureing the beta-ray asymmetry in coincidence with the decaying neutrons, it was demonstrated that individual spin-parity assignment for the excited stated of 17C was possible. This new method is very promissing for the studies of exotic nuclei. Combination with the helium ion trap may serve as a new tool for the systematic studies of exotic nuclei.

超流氦中的阿利安离子由于电致伸缩而形成氦原子微团簇。簇的结构被认为是高度对称的，因此可以保留核心离子的自旋方向。这一特征对于应用于远离稳定的不稳定核的光谱研究非常有吸引力。我们研究了超流氦作为离子阱的可行性和适用性。通过使用自旋极化 12B 光束确保了自旋极化的保存。注入离子保留其电荷的微团簇的形成概率高达注入离子的20%。在静电场下对团簇进行空间操纵。下一步是通过使用激光光泵浦来增强偏振。研究了泵浦的困难。作为光谱研究的应用，观测到了 17B 的β延迟中子达卡伊。通过测量与衰变中子同时发生的 β 射线不对称性，证明 17C 激发态的单独自旋宇称分配是可能的。这种新方法对于奇异核的研究非常有前景。与氦离子阱的结合可以作为系统研究奇异核的新工具。