Ion/atom trap with use of superfluid helium

使用超流氦的离子/原子陷阱

• 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

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.

由于电术而导致的氦气氦气中的Alian离子形成了氦原子的微簇。簇的结构被认为是高度对称的，因此可以保留核心离子的旋转方向。该特征对于远离稳定性的不稳定核的光谱研究非常有吸引力。我们通过使用自旋极化的12B梁来确保自旋极化的保存确保自旋极化的可行性和适用性。植入离子保留其电荷的微簇的形成概率高达隐含离子的20％。进行了静电场下簇的空间操纵。下一步是通过使用激光光学泵送来增加极化。已经研究了泵送的功能。随着光谱研究的应用，已经观察到了17B的β-戴雷德中子达卡伊。通过测量与衰减中子一致的β射线不对称性，可以证明可以为17C所述的激发的单个自旋 - 屈服分配。这种新方法非常用于研究外来核的研究。与氦离子陷阱的结合可以作为外来核系统研究的新工具。

项目成果

下田 正: "液体ヘリウムを用いたイオン/中性原子トラップ" 京大原子炉研究報告書. KURRI-TR-. (1997)

Tadashi Shimoda：“使用液氦的离子/中性原子陷阱”京都大学核反应堆研究报告（1997）。

T.Shimoda et al.: "Preservation of nuclear spin polarization of 12B in superfluid helium" Nuclear Physics. A588. 235c-240c (1995)

T.Shimoda 等人：“超流氦中 12B 核自旋极化的保存”核物理。

山本佳史: "スピン偏極した中性子過剰核17Bのβ-delayed中性子崩壊:解析結果" 京大原子炉研究報告書. KURRI-TR-. (1997)

Yoshifumi Yamamoto：“自旋极化富中子核 17B 的 β 延迟中子衰变：分析结果”京都大学反应堆研究报告（1997 年）。

S. Mitsuoka, T. Shimoda et al.: "Performance of fragment separator with homogeneously thick energy degrader" Nucl. Instr. and Meth.A372. 489-500 (1996)

S. Mitsuoka、T. Shimoda 等人：“具有均匀厚能量降解剂的碎片分离器的性能”Nucl。

S.Mitsuoka et al.: "Performance of fragment separator with homogeneously thick energy degrader" Nuclear Instruments and Methods in Physics Reserach. A372. 489-500 (1996)

S.Mitsuoka 等人：“具有均匀厚能量降解器的碎片分离器的性能”核仪器和物理研究方法。