The Distribution of Slowing-Down Times of Positrons Emitted from 22Na and 68Ge\68Ga Isotopes into Metals

Jerzy Dryzek; Paweł Horodek

doi:10.4028/www.scientific.net/MSF.666.10

Paper Titles

Preface/Committees

Electron and Positron Densities for Mono Vacancy in SiC
p.1

Influence of Electron-Electron Correlations and Lattice Effects on Positron-Electron Enhancement Factors
p.5

The Distribution of Slowing-Down Times of Positrons Emitted from ²²Na and ⁶⁸Ge\⁶⁸Ga Isotopes into Metals
p.10

A Computational Model for Nano Scale Cavities in the Atomic Structure of Polymer Melt and Comparisons to PALS
p.15

Calculation of Gamma Spectra for Positron Annihilation on Molecules
p.21

Investigation of Resonances in the Scattering of a Heavy ‘Positron’ by H₂ that Involve Vibrationally Excited Quasi-Bound States
p.25

Positron Annihilation Characteristics in Superstrong Magnetic Fields
p.31

HomeMaterials Science ForumMaterials Science Forum Vol. 666The Distribution of Slowing-Down Times of...

The Distribution of Slowing-Down Times of Positrons Emitted from ²²Na and ⁶⁸Ge\⁶⁸Ga Isotopes into Metals

Abstract:

The results of the Monte Carlo simulation, using GEANT4 codes, of the slowing-down time prior to the thermalization in metals for positrons emitted from the 22Na and 68Ge\68Ga sources are presented. Due to the energy spectrum and probabilistic processes accompanying positrons traversing a medium the slowing-down time exhibits a distribution which has a long tail. Nevertheless, the average value of the time is ranged from 0.4 ps to 8 ps depending on the density of the medium as it is for the 22Na positrons. For positrons emitted from the 68Ga nucleus the average value of the slowing-down time increases and it is ranged from 1 ps to 20 ps.

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Periodical:

Materials Science Forum (Volume 666)

Pages:

10-14

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.666.10

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Online since:

December 2010

Authors:

Jerzy Dryzek, Paweł Horodek

Keywords:

Positron Stopping Power, Slowing-Down Time

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