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Positron impact ionization of helium gas. Experiment

Positron interactions with a surface.

Positron lifetime spectra for Ar gas . Note time scales.

Positron lifetime spectra for porus Si

Positron lifetime spectra of amorphous Si02 at the positron incident energy of 2 keV and 15 keV.

Positron lifetime spectra of the PECVD grown a-Si

Positron lifetime spectrum in solid Q0. characterized by a single component witht 374 ps. The inset shows the positron distribution in the basal plane of C6o, with maxima in the interstitial regions of the fee lattice. From Sundar et al. .

Positron lifetime vs temperature for superconducting La 85Sr0.15CuC 4 with Tc 33 K. The lifetime variation in the non-superconducting sample, obtained by heating at 950 K in vacuum is also shown. From Jean et al. .

Positron lifetime vs temperature in YNi2B2C. The arrow indicates Tc. The continuous line is the fit based on a model incorporating the detrapping of positrons from shallow traps at carbon vacancies. From Sundar et al. .

Positron lifetimespectrum of methanol at

Positron piilser ,

Positron target chamber and microwave cavity for measuring fine structure interval in the n 2 state of positronium. G, grid T, copper target M, mirror W, window K, CsTe photocathode of the uv photon detector A, antennae Nal, annihilation y -ray detector.

Positron-argon elastic differential scattering cross sections. Experiment

Positron-atomic hydrogen and electron-atomic hydrogen total scattering cross sections. Experiment

Positron-H2 and electron- total scattering cross sections at low energies, Positron scattering. Experiment

Positron-H20 total scattering cross sections at low energies .

Positron-helium d-wave phase shifts

Positron-helium p-wave phase shifts

Positron-helium s-wave phase shifts for three helium models

Positron-sodium and electron-sodium total

Positronium formation cross sections for positron-argon scattering. Experiment

Positronium formation cross sections plotted as functions of the positronium kinetic energy for the following gases

Positronium formation in positron-hydrogen scattering. Experiment

Positronium formation in positron-potassium collisions. The experimental points are from Zhou et al. the open and solid circles are the upper and lower limits respectively. Theory

Positronium formation in positron-rubidium collisions. The experimental points are from Surdutovitch et al. the open and solid circles are the upper and lower limits respectively. Theory



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