Recent advances in the study of solid surfaces and thin films using variable-energy positron
beams are reviewed. In the first part the authors discuss the process of positron moderation …

Positronium is the simplest bound state, built of an electron and a positron. Studies of
positronium in vacuum and its decays in medium tell us about quantum electrodynamics …

Positron is the only probe that can detect individual atomic vacancies and small and large
vacancy clusters induced by irradiation with remarkable sensitivity, providing information …

To efficiently capture the energy of the nuclear bond, advanced nuclear reactor concepts
seek solid fuels that must withstand unprecedented temperature and radiation extremes. In …

In condensed matter initially fast positrons annihilate after having reached equi librium with
the surroundings. The interaction of positrons with matter is governed by the laws of ordinary …

The field of experimental positronium physics has advanced significantly in the last few
decades, with new areas of research driven by the development of techniques for trap** …

A beam of positrons is used to study positronium (Ps) formation at the surfaces of clean,
single-crystal targets. The Ps formation probability changes with incident energy E as (EE 0+ …

The brightness of slow positron beams can be enhanced significantly by repeated stages of
moderation, acceleration and focusing. Presently available data suggest that the source spot …

We report measurements of the transmission of 1-6-keV energy positrons through films of Al,
Cu, and Si up to 3000 Å thick. When the thickness is expressed in terms of mass per unit …

The probability for a positron (e+) incident upon a metal surface either to be converted into a
positronium atom (Ps) which leaves the surface or to be reemitted as a bare e+ is calculated …