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Transmission of positrons with aβ + energy distribution through thin films

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Abstract

The transmission through Al foils of isotropically implanted positrons from a22Naβ + source has been measured. It is shown that the transmission is reasonably well-described using an exponential profile once backscattering is accounted for, except for thicknesses below approximately 7 mg/cm2. Below this thickness, the measured transmission is slightly less than that predicted by the exponential profile. Such a deviation has previously been observed for collimated positrons, suggesting that the implantation profile has no significant dependence on the spatial distribution of the incident positrons. This deviation is critical for the proper interpretation of positron lifetime experiments on thin films using a conventional positron lifetime spectrometer.

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Authors and Affiliations

  1. Centre for Electrophotonic Materials and Devices, Department of Engineering Physics, McMaster University, L8S 4L7, Hamilton, Ontario, Canada

    J. Mahony, G. Tessaro & P. Mascher

  2. Institut für Kernphysik, Technische Universität Graz, A-8010, Graz, Austria

    T. Friessnegg & W. Puff

Authors
  1. J. Mahony
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  2. T. Friessnegg
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  3. G. Tessaro
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  4. P. Mascher
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  5. W. Puff
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Mahony, J., Friessnegg, T., Tessaro, G. et al. Transmission of positrons with aβ + energy distribution through thin films. Appl. Phys. A 63, 299–301 (1996). https://doi.org/10.1007/BF01567885

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  • DOI: https://doi.org/10.1007/BF01567885

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