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Optimisation of the thickness of the moderator for positron annihilation process study in Ar gas

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Abstract

To investigate the deceleration and annihilation processes of positron in noble gas, we attempted to optimise the thickness of the positron moderator. The results of the decreasing trend of free positron intensity and ortho-positronium intensity with the thickness, and the annihilation rate suggest that the energy of almost all the positrons passed through the metal foils was much above the positronium formation threshold of 9 eV. Total thickness of 0.1 g cm-2 of the moderator and the Ar gas was required to stop almost all the positron in Ar gas.

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Authors and Affiliations

  1. Institute for Excellence in Higher Education, Tohoku University, 980–8576, Sendai, Japan

    Toshitaka Oka & Tsutomu Sekine

  2. Department of Chemistry, Tohoku University, 980–8578, Sendai, Japan

    Toshitaka Oka, Yosuke Sano & Yasushi Kino

Authors
  1. Toshitaka Oka
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  2. Yosuke Sano
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  3. Yasushi Kino
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  4. Tsutomu Sekine
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Correspondence to Toshitaka Oka.

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Oka, T., Sano, Y., Kino, Y. et al. Optimisation of the thickness of the moderator for positron annihilation process study in Ar gas. Eur. Phys. J. D 68, 156 (2014). https://doi.org/10.1140/epjd/e2014-40807-2

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  • DOI: https://doi.org/10.1140/epjd/e2014-40807-2

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