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
• 负责人: STRASSER Patrick
• 金额: $ 12.4万
• 依托单位: High Energy Accelerator Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20340062/
• 关键词: ミュオン; 固体水素; イオン源; ミュオンX線; イオン注入; 希土類元素; サマリウム

In this research, we proposed to implant stable samarium isotopes in thin solid hydrogen films to form muonic atoms through the direct muon transfer reaction, and then conduct muonic X-ray spectroscopy with those implanted ions to determine isotope shifts and transfer rates. The isotope shift of muonic atom X-rays measures the nuclear charge distribution of the nucleus, and samarium isotopes are of particular interest because they show very abrupt changes in their nuclear characteristics. This development is crucial in order to expand the solid hydrogen film method to produce muonic atoms with unstable nuclei in the future. Very promising results were obtained at the RIKEN-RAL muon facility with stable samarium isotopes ^<148>Sm and ^<152>Sm of about 1 ppm implanted into a thin solid deuterium film. Clear X-rays peaks from the 2p→1s muonic transitions in samarium (about 4.5MeV) were observed, and the isotope shift was consistent with that ^<148>Sm still has a spherical nucleus, while the nucleus of ^<152>Sm is highly deformed.

在这项研究中，我们提出了在薄的固体氢膜中注入稳定的钐同位素，通过直接的μ子转移反应形成μ子原子，然后用这些注入的离子进行μ子X射线光谱，以确定同位素位移和转移率。μ子原子X射线的同位素位移测量了原子核的核电荷分布，钐同位素特别令人感兴趣，因为它们的核特性显示出非常突然的变化。这一发展对于扩展固体氢膜方法以在未来产生具有不稳定核的μ子原子至关重要。在RIKEN-RAL的μ子设施中，将大约1 ppm的稳定钐同位素1 <148>Sm和1 <152>Sm注入到薄的固体氘膜中，获得了非常有希望的结果。在4.5MeV的钐中观察到了清晰的2 p → 1 s μ子跃迁的X射线峰，同位素位移与^<148>Sm仍具有球形核，而^ Sm的核<152>已高度变形相一致。

项目成果

J-PARC decay muon channel construction status

J-PARC衰变μ子通道建设现状

• 发表时间: 2010
• 期刊: Journal of Physics : Conference Series 225
• 作者: P.Strasser;K.Shimomura;A.Koda;N.Kawamura;H.Fujimori;S.Makimura;Y.Kobayashi;K.Nakahara;M.Kato;S.Takeshita;M.Hiraishi;M.Miyazaki;W.Higemoto;T.U.Ito;K.Ninomiya;K.Ishida;M.K.Kubo;R.Kadono;K.Nishiyama;Y.Miyake
• 通讯作者: Y.Miyake

Alignment and shields in the M2 primary proton beamline at J-PARC

J-PARC M2 初级质子束线中的对准和屏蔽

• 发表时间: 2009
• 期刊: Nucl. Instr. and Meth. in Phys. Res. A 600
• 作者: P. Strasser;Y. Miyake;N. Kawamura;S. Makimura;K. Nishiyama
• 通讯作者: K. Nishiyama

Muon Spectroscopy with Trace Alkaline-Earth and Rare-Earth Isotopes Implanted in Solid D2

固体 D2 中植入微量碱土和稀土同位素的 μ 子光谱

• 发表时间: 2009
• 期刊: Hyperfine Interactions 193
• 作者: P.Strasser;A.Taniguchi;T.Matsuzaki;K.Ishida;Y.Matsuda;S.Ohya;M.Iwasaki;K.Nagamine
• 通讯作者: K.Nagamine

Pulsed source of ultra low energy positive muons for near-surface $\mu$SR studies

用于近地表 $mu$SR 研究的超低能量正 μ 子脉冲源

• 发表时间: 2008
• 期刊: Nuclear Instruments and Methods in Physics Research B 266
• 作者: P. Bakule;et al.
• 通讯作者: et al.

Muon Transfer Studies in Solid D2 with Implanted Rare-Earth Ions

植入稀土离子的固体 D2 中的 μ 子传递研究

• 发表时间: 2010
• 期刊: RIKEN Accelerator Progress Report 43
• 作者: P.Strasser;A.Taniguchi;S.Ohya;T.Matsuzaki;K.Ishida;Y.Matsuda;M.Iwasaki;K.Nagamine
• 通讯作者: K.Nagamine