论文标题
亚稳态的强烈光束
Intense beam of metastable Muonium
论文作者
论文摘要
Muonium Lamb Shings和精细结构的精确光谱需要2S兆元的可靠来源。迄今为止，梁翼技术是在真空中创建这种光束的唯一证明的方法。以前使用该技术的实验是统计有限的，而新的测量值将从低能MUON（$ <20 $ keV）设施的高效2S产生中受益匪浅。如此丰富的低能$ \ mathrm {μ^+} $的来源仅在近年来才可用，例如在Paul Scherrer Institute的低能量MUON光束线上。使用此源，我们报告了成功创造了一个强烈的，有向肌的横梁。我们发现，即使理论上的Muonium分数在低能范围内最大，$ 2-5 $ KEV，横梁线的箔和传输特性散布略高的$ \ Mathrm {μ^+} $耗能为$ 7-10 $ kev。我们估计，未来的羔羊换档测量值每秒几个事件的事件检测率是可行的，从而使精度通过以前的确定增加了两个数量级。
Precision spectroscopy of the Muonium Lamb shift and fine structure requires a robust source of 2S Muonium. To date, the beam-foil technique is the only demonstrated method for creating such a beam in vacuum. Previous experiments using this technique were statistics limited, and new measurements would benefit tremendously from the efficient 2S production at a low energy muon ($<20$ keV) facility. Such a source of abundant low energy $\mathrm{μ^+}$ has only become available in recent years, e.g. at the Low-Energy Muon beamline at the Paul Scherrer Institute. Using this source, we report on the successful creation of an intense, directed beam of metastable Muonium. We find that even though the theoretical Muonium fraction is maximal in the low energy range of $2-5$ keV, scattering by the foil and transport characteristics of the beamline favor slightly higher $\mathrm{μ^+}$ energies of $7-10$ keV. We estimate that an event detection rate of a few events per second for a future Lamb shift measurement is feasible, enabling an increase in precision by two orders of magnitude over previous determinations.
