Abstract
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 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 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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000438697Publication status
publishedExternal links
Journal / series
The European Physical Journal CVolume
Pages / Article No.
Publisher
SpringerOrganisational unit
03503 - Rubbia, André / Rubbia, André
Funding
818053 - MuoniuM lAser SpectroScopy 1999 (EC)
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