Low-temperature π++ channelling in gold and α-ironchannelling in gold and α-iron

W. Staiger, E. Widmann, S. Connell, G. Fabritius, K. Maier, A. Seeger

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1 Citation (Scopus)


The lattice sites of positive pions in gold have been determined as a function of temperature by means of π++ channelling experiments. A blocking pattern in the <100> direction at low temperatures indicates that only octahedral interstitial sites are occupied. The vanishing of this pattern and the reduction of muon flux enhancement observed in <110> if T is raised above the Debye temperature (165 K) may be interpreted in terms of muon dechannelling owing to the thermal vibrations of the lattice atoms. Time-differential π++ channelling studies on α-iron showed between 20 K and 70 K a strong dependence of the channelling profiles on the time the pions spent in the sample. The 'young' pions are well localized on O- or T-sites whereas the 'old' pions either become delocalized or occupy sites with strongly reduced symmetry. A model accounting for these observations is suggested. It is argued that there is a close relationship to earlier μ+ SR experiments.

Original languageEnglish
Pages (from-to)701-709
Number of pages9
JournalHyperfine Interactions
Issue number1-4
Publication statusPublished - Feb 1991
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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