Slow Muon Physics
Recently, slow positive muons (μ+) have been observed to be emitted from solid rare-gas moderators exposed to a 4.2 MeV incident μ+ beam. Energy spectra obtained from the time of flight data indicate a maximum at ∿ 5 eV with a tail extending to higher energies. The data suggest a “hot muon” emission mechanism, implying a long diffusion length for low-energy μ+ in these solids. Of the targets measured, argon was observed to produce the highest yield (∿ 10−5slow μ+ per incident μ+), providing a useful flux for further experimentation. The discussion presented here centers around these results and their future implications for slow μ+, Mu (μ+e−) and Mu− (μ+e−e−) beams. The applications of such beams will also be discussed.
KeywordsArgon Helium Stein Xenon Halide
Unable to display preview. Download preview PDF.
- 1.See for example Positron Scattering in Gases, J.W. Humberston and M.R.C. McDowell, eds. ( Plenum, New York, 1983 ).Google Scholar
- D.R. Harshman, Invited Talk, 21 October 1985, Lawrence Livermore National Laboratory, Livermore, California, USAGoogle Scholar
- 4.D.R. Harshman, A.P. Mills, Jr., J.L. Beveridge, K.R. Kendal, G.D. Morris, M. Senba, J.B. Warren, A.S. Rupaal and J.H. Turner, Phys. Rev. Lett. (submitted)Google Scholar
- 8.J.H. Brewer, K.M. Crowe, F.N. Gygax and A. Schenck, in Muon Physics, V.W. Hughes and C.S. Wu eds. (Academic, New York, 1975 ) Vol. I II.Google Scholar
- H.H. Anderson and J.F. Ziegler, Hydrogen Stopping Powers and Ranges in All Elements, ( Pergamon, New York, 1977 );Google Scholar
- 10.Rare Gas Solids, M.L. Klein and J.A. Venables, eds. (Academic, London, 1976 ). Rare-gas solids grown from the vapor phase are typically polycrystalline.Google Scholar
- 11.W.E. Kaupilla and T.S. Stein, in Ref. 1, p. 15.Google Scholar
- 12.D.R. Harshman, Ph.D. Thesis, Univ. of British Columbia (1986), available from University Microfilms, Ann Arbor, MI.Google Scholar
- 17.K. Nagamine, Invited talk at IIIrd LAMPF II Workshop ( Los Alamos, July 1983 );Google Scholar
- A Ohsaki, T. Watanabe, K. Nagamine and I Iguchi, Abstract A62, IXth Int. Conf. on Atomic Phys. (Seattle, Wa., USA, July 1984 );Google Scholar
- Q. Ma, X. Cheng, Z. Liu, Y. Liu and T. Watanabe, ibid, Abstract A63.Google Scholar