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Some Remarks on Diffusion Model of Positron Reemission and/or Positron Surface Trapping

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Dębowska M., Świątkowski W.
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vol. 95
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issue 4
515-520
EN
The problem of a role of boundary conditions in a diffusion model of positron reemission is discussed. It was shown that a sink rate cannot change from zero up to infinity but has an upper limit equal to a half of a mean positron velocity. Some additional relations connected with this result are presented as well.
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Does the Dielectric-Dielectric Interface Affect the Positron Diffusion Current?

100%
Beliczyński J., Dębowska E., Świątkowski W.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
251-254
EN
The angular correlations of annihilation radiation have been measured for NaI, NaF and (NaI)_{0.65}(NaF)_{0.35} alloy. The angular correlations of annihilation radiation for the alloy appeared to be more similar to the one for NaI than it should be expected from the content of NaI in the alloy. The result can be easily explained by assuming that NaI/NaF interface acts directionally on positron diffusion movement.
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