Barkas effect in stopping of fast diclusters in solids

We study the stopping of a fast proton dicluster moving through a metal target with an electron gas described by a hydrodynamic model. Both the first-order and the second-order expressions are derived and computed for the total stopping force on the cluster, giving a nonlinear correction of the Bark...

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Bibliographic Details
Published in:Radiation effects and defects in solids 2016-02, Vol.171 (1-2), p.109-122
Main Authors: Wilson, Tyler, Mišković, Z.L.
Format: Article
Language:English
Subjects:
Barkas effect
Clusters
Computational fluid dynamics
Fluid flow
Gases
Hydrodynamics
Mathematical analysis
Mathematical models
molecule
Molecules
Nonlinearity
Radiation
Radiation effects
stopping power
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Summary:We study the stopping of a fast proton dicluster moving through a metal target with an electron gas described by a hydrodynamic model. Both the first-order and the second-order expressions are derived and computed for the total stopping force on the cluster, giving a nonlinear correction of the Barkas type. Results are shown as functions of the cluster speed and the interproton distance in the cases of a randomly oriented dicluster and a colinear dicluster consisting of two protons aligned in the direction of motion. We find that the Barkas correction increases the overall stopping force, especially at lower speeds and shorter interproton distances. While the Barkas correction is found to accentuate interferences in the vicinity effect for colinear diclusters, it presents an insignificant contribution to the vicinity effect for randomly oriented diclusters.
ISSN:1042-0150
1029-4953
DOI:10.1080/10420150.2015.1137918