Moderation and diffusion of positrons in tungsten meshes and foils | Zendy

A. I. Williams | Zendy; D. J. Murtagh | Zendy; S. E. Fayer | Zendy; Susan L. Andersen | Zendy; J. Chevallier | Zendy; Á. Kövér | Zendy; P. Van Reeth | Zendy; J W Humberston | Zendy; G. Laricchia | Zendy

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Moderation and diffusion of positrons in tungsten meshes and foils

Author(s) -

A. I. Williams,

D. J. Murtagh,

S. E. Fayer,

Susan L. Andersen,

J. Chevallier,

Á. Kövér,

P. Van Reeth,

J W Humberston,

G. Laricchia

Publication year - 2015

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4930033

Subject(s) - tungsten , polygon mesh , materials science , diffusion , work (physics) , thin film , condensed matter physics , geometry , physics , thermodynamics , nanotechnology , metallurgy , mathematics

The efficiency of tungsten meshes and thin foils for moderation of fast positrons from 22Na has\udbeen investigated in transmission geometry and a fair agreement has been found with previous\udexperimental results where directly comparable. For foils, the dependence on material thickness is\udfound to be similar to the prediction of the Vehanen-M€akinen diffusion model; however, the magnitude\udis 5–10 times lower. A broad consensus is observed between experiment and the results of a\udthree-dimensional model developed in this work. For a given thickness, meshes are found to be\udgenerally better than foils by around a factor of 10 with a maximum efficiency (103) comparable\udto that achieved with thin single crystal foils, in accord with previous measurements and the results\udof the present model

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