6533b854fe1ef96bd12adf25

RESEARCH PRODUCT

The multi-scattering model for calculations of positron spatial distribution in the multilayer stacks, useful for conventional positron measurements

Jerzy DryzekKrzysztof Siemek

subject

PhysicsAnnihilationPositronStack (abstract data type)Semi-infiniteMathematical modelScatteringMonte Carlo methodPhysics::Accelerator PhysicsGeneral Physics and AstronomyAtomic physicsAbsorption (electromagnetic radiation)Computational physics

description

The spatial distribution of positrons emitted from radioactive isotopes into stacks or layered samples is a subject of the presented report. It was found that Monte Carlo (MC) simulations using GEANT4 code are not able to describe correctly the experimental data of the positron fractions in stacks. The mathematical model was proposed for calculations of the implantation profile or positron fractions in separated layers or foils being components of a stack. The model takes into account only two processes, i.e., the positron absorption and backscattering at interfaces. The mathematical formulas were applied in the computer program called LYS-1 (layers profile analysis). The theoretical predictions of the model were in the good agreement with the results of the MC simulations for the semi infinite sample. The experimental verifications of the model were performed on the symmetrical and non-symmetrical stacks of different foils. The good agreement between the experimental and calculated fractions of positrons...

yearjournalcountryeditionlanguage
2013-08-21Journal of Applied Physics
https://doi.org/10.1063/1.4818578