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RESEARCH PRODUCT
Positron implantation profiles in layered samples
P. HorodekJerzy Dryzeksubject
PhysicsNuclear and High Energy PhysicsHigh energyAstrophysics::High Energy Astrophysical PhenomenaPositron Lifetime SpectroscopyPhysics::Medical PhysicsMonte Carlo methodchemistry.chemical_elementLow energyPositronchemistryAluminiumPhysics::Accelerator PhysicsHigh Energy Physics::ExperimentAtomic physicsInstrumentationLayer (electronics)Positron annihilationdescription
The paper presents theoretical and experimental studies of the positron implantation profiles in layered samples. The Monte Carlo simulations performed using the GEANT4 toolkit reveal accumulation of positrons in the denser layer embedded between two less dense layers. That effect is significant not only for low energy positrons at slow monoenergetic positron beams but also for high energy positrons which are emitted from radioactive nuclei in conventional experiments. Measurements of the positron implantation profile into the samples which consist of silver and aluminium foils of different thickness show profile features which correspond well with those simulated by the GEANT4 toolkit for examined cases. We propose to call this phenomenon the accumulation effect of energetic positrons.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-11-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |