Generation and Investigation of radium muonic atoms in thin solid hydrogen films
固体氢薄膜中镭μ子原子的产生和研究
基本信息
- 批准号:15340091
- 负责人:
- 金额:$ 10.37万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2003
- 资助国家:日本
- 起止时间:2003 至 2005
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this research, we proposed to implant radium isotopes in solid hydrogen films to form muonic atoms with unstable nuclei, and conduct muonic X-ray spectroscopy to determine transfer rates, isotope shifts and nuclear charge radii. The originality of this method was based on the muon transfer reaction mechanism to higher Z nuclei in solid hydrogen to efficiently produce muonic atoms, since only a very small concentration of nuclei (ppm level) is required to perform muonic X-ray spectroscopy experiments. The goal of this project was to develop a new ion source that can produce long-lived radioactive radium isotope ions, in order to be implanted in solid hydrogen films and produce muonic atoms with radioactive nuclei. This new ion source needed to be designed so that it can be used with the existing experimental apparatus (μA^*) for muonic atom spectroscopy with implanted ions in solid hydrogen films installed at the RIKEN-RAL Muon Facility. The main achievement of this 3 years project w … More as the construction of a new surface ionization ion source with the aim of using in the future radioactive isotopes. A surface ionization type ion source was selected because it is capable of producing ions from alkali and alkaline-earth metals with high efficiency, which is ideal to produce radium isotope ions, but also to produce many other stable ion beams for optimization and tuning purposes. In the case of radium, since there are no stable isotopes, the element barium is selected because it is in the same group and has similar ionization energy. Therefore, by mixing stable barium isotope as a marker, it is possible to first adjust and optimize efficiently the experimental conditions using stable nucleus, and then switch easily to unstable nucleus to perform the experiment with radium ions. This new surface ionization ion source was tested last year at KURRI (Research Reactor Institute, Kyoto University). Barium ions were successfully ionized and barium beams of several μA were produced. The stability of the ion source was also examined, and no significant beam deterioration was observed after several hours of operation. In January 2006, it was shipped to the Rutherford Appleton Laboratory in the UK, and installed on the μA^* experimental apparatus at RIKEN-RAL port 4 area. The installation went smoothly, and is now almost completed. The first experiment using the new ion source is scheduled sometime this autumn. Barium beams will be produced and implanted in solid hydrogen films to conduct muonic X-ray spectroscopy experiments. The first experimental results will be reported in a later publication. However, before any radium radioactive isotopes can be used in this system, several modifications and improvements to the existing μA^* apparatus will be required to handle radioactive materials safely. In particular, the pumping system will need to be upgraded and an exhaust stack installed. Local radiation shielding will also be needed around the ion source. Less
在这项研究中,我们提出将镭同位素注入固体氢膜中,形成具有不稳定核的μ子原子,并进行μ子X射线光谱以确定转移率、同位素位移和核电荷半径。该方法的独创性是基于μ子转移反应机制到固体氢中较高Z的原子核,从而有效地产生μ子原子,因为只需要非常小的原子核浓度(ppm级)即可进行μ子X射线光谱实验。该项目的目标是开发一种新的离子源,可以产生长寿命的放射性镭同位素离子,以便植入固体氢膜中并产生具有放射性核的μ子原子。这种新的离子源需要设计成能够与安装在 RIKEN-RAL Mu 子设施的现有实验装置 (μA^*) 一起使用,用于在固体氢薄膜中注入离子的 μ 子原子光谱。这个为期三年的项目的主要成就是建造了一个新的表面电离离子源,旨在用于未来的放射性同位素。选择表面电离型离子源是因为它能够高效地从碱金属和碱土金属产生离子,非常适合产生镭同位素离子,而且还可以产生许多其他用于优化和调谐目的的稳定离子束。就镭而言,由于没有稳定的同位素,因此选择元素钡,因为它属于同一族并且具有相似的电离能。因此,通过混合稳定的钡同位素作为标记,可以首先有效地调整和优化使用稳定核的实验条件,然后轻松切换到不稳定核以进行镭离子的实验。这种新型表面电离离子源去年在 KURRI(京都大学研究堆研究所)进行了测试。钡离子成功电离并产生数μA的钡束。还检查了离子源的稳定性,运行几个小时后没有观察到明显的离子束劣化。 2006年1月,运往英国卢瑟福阿普尔顿实验室,安装在RIKEN-RAL port 4区的μA^*实验装置上。安装过程很顺利,现在已经快完成了。使用新离子源的第一次实验计划于今年秋天的某个时候进行。将产生钡束并将其植入固体氢薄膜中以进行μ子X射线光谱实验。第一个实验结果将在稍后的出版物中报告。然而,在该系统中使用任何镭放射性同位素之前,需要对现有的μA^*设备进行一些修改和改进,以安全地处理放射性材料。特别是,需要升级泵系统并安装排气管。离子源周围还需要局部辐射屏蔽。较少的
项目成果
期刊论文数量(25)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Generation of low-energy muons with laser resonant ionization
用激光共振电离产生低能 μ 子
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:Y. Matsuda;et. al.
- 通讯作者:et. al.
P.Strasser et al.: "Muon spectroscopy with unstable nuclei"Journal of Physics G : Nuclear and Particle Physics. 29. 2047-2049 (2003)
P.Strasser 等人:“不稳定核的 μ 子光谱”《物理学杂志 G》:核与粒子物理学。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Recent Development of a point positive muon source at the RIKEN‐RAL muon facility
- DOI:10.1063/1.1818423
- 发表时间:2004-10
- 期刊:
- 影响因子:0
- 作者:Y. Matsuda;P. Bakule;P. Strasser;K. Ishida;T. Matsuzaki;M. Iwasaki;Y. Miyake;K. Shimomura;S. Makimura;K. Nagamine
- 通讯作者:Y. Matsuda;P. Bakule;P. Strasser;K. Ishida;T. Matsuzaki;M. Iwasaki;Y. Miyake;K. Shimomura;S. Makimura;K. Nagamine
Radioactive muonic atom studies with intense muon beams
用强μ子束进行放射性μ子原子研究
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:P.Strasser;K.Nagamine;T.Matsuzaki;K.Ishida;Y.Matsuda;M.Iwasaki;P.Strasser et al.;K.Ishida et al.;P.Strasser et al.;P.Strasser et al.
- 通讯作者:P.Strasser et al.
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STRASSER Patrick其他文献
STRASSER Patrick的其他文献
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{{ truncateString('STRASSER Patrick', 18)}}的其他基金
Isotope Shift Measurements of Samarium Muonic Atom X-rays in Thin Solid Deuterium Films
固体氘薄膜中钐μ子原子 X 射线的同位素位移测量
- 批准号:
20340062 - 财政年份:2008
- 资助金额:
$ 10.37万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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