Observation of muonium in vacuum

P. R. Bolton, A. Badertscher, P. O. Egan, C. J. Gardner, M. Gladisch, V. W. Hughes, D. C. Lu, M. Ritter, Paul A Souder, J. Vetter, G. Zu Putlitz, M. Eckhause, J. Kane

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23 Scopus citations


The first observation of muonium (+e-) in vacuum, produced when a low-energy positive muon beam impinges on a thin foil target, is reported. It is found that +e- emerges from the foil surface predominantly with energies of less than 20 keV. The results show that the Clinton P. Anderson Meson Physics Facility stopped-muon channel operating at E=4.0 MeV with an average flux of 3×106+/s can produce roughly 103+e-/s in vacuum from thin targets of Be, C, Al, Cu, Ag, and Au.

Original languageEnglish (US)
Pages (from-to)1441-1444
Number of pages4
JournalPhysical Review Letters
Issue number20
StatePublished - 1981
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Bolton, P. R., Badertscher, A., Egan, P. O., Gardner, C. J., Gladisch, M., Hughes, V. W., Lu, D. C., Ritter, M., Souder, P. A., Vetter, J., Zu Putlitz, G., Eckhause, M., & Kane, J. (1981). Observation of muonium in vacuum. Physical Review Letters, 47(20), 1441-1444. https://doi.org/10.1103/PhysRevLett.47.1441