[HTML][HTML] Moderation and diffusion of positrons in tungsten meshes and foils
AI Williams, DJ Murtagh, SE Fayer… - Journal of Applied …, 2015 - pubs.aip.org
The efficiency of tungsten meshes and thin foils for moderation of fast positrons from 22 Na
has been investigated in transmission geometry and a fair agreement has been found with
previous experimental results where directly comparable. For foils, the dependence on
material thickness is found to be similar to the prediction of the Vehanen-Mäkinen diffusion
model; however, the magnitude is 5–10 times lower. A broad consensus is observed
between experiment and the results of a three-dimensional model developed in this work …
has been investigated in transmission geometry and a fair agreement has been found with
previous experimental results where directly comparable. For foils, the dependence on
material thickness is found to be similar to the prediction of the Vehanen-Mäkinen diffusion
model; however, the magnitude is 5–10 times lower. A broad consensus is observed
between experiment and the results of a three-dimensional model developed in this work …
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