Hyperfine Interactions

, Volume 119, Issue 1–4, pp 3–10

Kinetic energies of exotic H atoms at formation and cascade

  • F. Kottmann
  • H. Daniel
  • F.J. Hartmann
  • P. Hauser
  • C. Maierl
  • V.E. Markushin
  • M. Mühlbauer
  • C. Petitjean
  • R. Pohl
  • W. Schott
  • D. Taqqu
Article

Abstract

The complex balance of processes occurring at the cascade of exotic H-atoms is usually described by the so-called standard cascade model, but this model neglects variations of the kinetic energy T of the exotic atom during the cascade which are crucial for the analysis of several important experiments. New experimental results on Tµp at H2 pressures between 0.063 and 4 hPa demonstrate the importance of acceleration due to Coulomb de-excitation processes at highly excited µp levels n > 9. The data at the lowest density are sensitive to the initial values of the kinetic energy and n-levels at the moment of atomic capture. From the measured low-energy tail of the Tµp-distribution it can be concluded that a considerable part of the µp(2s) atoms is metastable at pressures of a few hPa.

exotic atom cascade 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • F. Kottmann
    • 1
  • H. Daniel
    • 3
  • F.J. Hartmann
    • 3
  • P. Hauser
    • 2
  • C. Maierl
    • 3
  • V.E. Markushin
    • 2
  • M. Mühlbauer
    • 3
  • C. Petitjean
    • 2
  • R. Pohl
    • 2
  • W. Schott
    • 3
  • D. Taqqu
    • 2
  1. 1.Institut für TeilchenphysikETH-HönggerbergZürichSwitzerland
  2. 2.Paul Scherrer InstitutVilligen PSISwitzerland
  3. 3.Physik-DepartementTechnische Universität MünchenGarchingGermany

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