Study of the e+ Distribution in a Layered Stack Sample Using Positron Lifetime Spectroscopy
The results of the Monte Carlo (MC) simulations, using GEANT4 codes, indicate the enhancement of the fraction of the e+ in the denser regions of the sample embedded by the less dense environment. The positron lifetime measurements, performed for two stacks of layers consisting of pure aluminum and silver do not seem to reveal this effect. Some features of the e+ distribution detected in the experiments are not reproduced by the MC simulations.
J. Dryzek and P. Horodek, "Study of the e+ Distribution in a Layered Stack Sample Using Positron Lifetime Spectroscopy", Materials Science Forum, Vol. 666, pp. 62-66, 2011