Precise study on muon transfer process between hydrogen isotopes with X-ray measurement

X射线测量精确研究氢同位素间μ子传递过程

• 批准号: 12640398
• 负责人: AKAMOTO Shinichi
• 金额: $ 2.3万
• 依托单位: Japan Atomic Energy Research Institute (2002)The High Energy Accelerator Research Organization (2000-2001)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640398/
• 关键词: munic atom; exotic atom; muon transfer reaction; de-excitation process; muonic X-ray; Si(Li) X-ray detector; ミューオン原子; ミューオン移行反応; ミューオンX線; エキゾティク原子

When a muon stops m the mixture of hydrogen isotopes, the muon in a lighter muonic atom may transfer to a heavier nudeus with collision, forming another muonic atom. This transfer takes place between the principal quantum number. The smaller the energy gap is, the faster the transfer reaction is. I have established the method to estimate the numbers of muonic atoms in the ground state by detecting Lyman X-rays, and started direct measurement of muon transfer phenomenon. In the preparatory experiment, a delay component seems to exist only in the time spectrum of dμ Kα X-rays. No other time spectra show similar delayed components.An experiment on muon transfer phenomenon was performed with DC muon beam in TRUIM, CANADA to improved time resolution of X-ray detection. The data of the second experimental run, whose quality is better, were analyzed last year. The data of the first experimental run were analyzed this year to improve the statistics of the data The number of dμ Kα. X-rays in the delayed component of decay constant of 71 nsec is found to be about 30% of the total number of dμ Kα X-rays. This is almost the same as the number of dμ atoms that consist of the muons transferring from of pμ atoms. The existence of the similar delayed component in the time spectrum of dμ Kβ X-rays was exduded with 95 % confidence level This phenomena is dosely related to the dμ atoms that consist of the muons transferring from of pμ atoms. The state of principal quantum number n=2 may have important dues.

当一个介子在氢同位素混合物中停止时，一个较轻的介子原子中的介子可能会在碰撞中转移到一个较重的原子核中，形成另一个介子原子。这种转移发生在主量子数之间。能隙越小，转移反应越快。我已经建立了通过探测莱曼X射线来估算基态Muon原子数的方法，并开始了对Muon转移现象的直接测量。在预备实验中，延迟分量似乎只存在于dμKαX射线的时间谱中。为了提高X射线探测的时间分辨率，在加拿大特鲁姆用直流Muon束进行了一项关于Muon转移现象的实验，以提高X射线探测的时间分辨率。去年对质量较好的第二次试运行数据进行了分析。今年对第一次试验运行的数据进行了分析，以改进数据的统计，即dμKα的数量。衰变常数为71nsec的延迟分量中的X射线约占dμKαX射线总数的30%。这几乎与dμ原子的数量相同，dμ原子是由p个Muon原子组成的。DμKβX射线时间谱中类似延迟分量的存在具有95%的置信度，这一现象与dμ原子的存在密切相关，它由pμ原子中的介子组成.主量子数n=2的状态可能具有重要的贡献。