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Muonium desorption to vacuum from hot iridium surface

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Abstract

Slow muonium (Mu) emission from the surface of iridium (Ir) foil has been observed in vacuum above \sim1200\ K with a yield of 5(1)% Mu per incident muon stopped in the foil. The relative Mu signal was found to be thermally activated with Ea=1.86(1)\ eV. Analysis of the time‐differential evolution of Mu in vacuum at TIr=1580\ K showed that the trapping rate of positive muons during diffusion in the bulk Ir was nearly zero. In situ measurements of the surface of Ir with X‐ray photoelectron spectroscopy verified that the main source of impurities in the 99.9%‐Ir was molybdenum (Mo).

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Authors and Affiliations

  1. Research Development Corporation of Japan (JRDC), Sakigake kenkyu 21 PRESTO, c/o Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351‐01, Japan

    A. Matsushita

  2. Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351‐01, Japan

    A. Matsushita & K. Nagamine

  3. Meson Science Laboratory, Faculty of Science, The University of Tokyo, Hongo, Bunkyo‐ku, Tokyo, 113, Japan

    K. Nagamine

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  1. A. Matsushita
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  2. K. Nagamine
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Matsushita, A., Nagamine, K. Muonium desorption to vacuum from hot iridium surface. Hyperfine Interactions 106, 283–289 (1997). https://doi.org/10.1023/A:1012626932432

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