Systematic differences in the proton's charge radius, as determined by ordinary atoms and muonic atoms, have caused a resurgence of interest elastic lepton scattering measurements. The defined slope form factor at Q$^2$=0, does not depend on probe. Any difference apparent size proton, when from versus hydrogen, could point to new physics or need for higher order corrections. While recent measur...

There is much interest in studying processes that can be described as almost-forward scattering: e.g. the small-x problem in the context of deep-inelastic scattering in QCD [1] (via the optical theorem), the small-angle Bhabha scattering in QED [2], etc. In such problems one deals with a kinematical situation when the scattering of two particles k k k k 1 2 3 4 o (e.g. virtual photon and proton...

1,1-difluoroethylene (1,1-C2H2F2) molecules have been studied for the first time experimentally and theoretically by electron and positron impact. 0.4-1000 eV electron and 0.2-1000 eV positron impact total cross sections (TCSs) were measured using a retarding potential time-of-flight apparatus. In order to probe the resonances observed in the electron TCSs, a crossed-beam method was used to inv...

Positron annihilation spectroscopy using lifetime and Doppler broadening allows the characterization of lithiation state in LiCoO2 thin film used cathode lithium-ion batteries. The results reflect positron spillover because presence graphite between oxide grains real Li-ion This produces an effect measured parameters which are sensitive to delocalized electrons from lithium atoms as Compton sca...

Positron creation in crossed-beam collisions of high-energy, fully stripped heavy ions is investigated within the coupled-channel formalism. In comparison with fixed-target collisions of highly stripped heavy-ion projectiles positron production probabilities are enhanced by more than one order of magnitude. The increase results from the possibility to excite electrons from the negative energy c...

Positrons have been used for material analysis not only because of their novel characteristics, such as an ability to detect open-volume type defects in materials, but also because interactions with solids differ from those of electrons in such processes as scattering and diffraction. Monoenergetic positron beams and microbeams were developed in the 1980s, and positron experiments have made pro...

The introduction of a longitudinal polarised positron beam in an ee linear collider calls for its polarisation monitoring and measurement at low energies near its production location. Here it is shown that a relatively simple Bhabha scattering polarimeter allows, at energies below 5000 MeV, a more than adequate positron beam longitudinal polarisation measurement by using only the final state el...