In this work a characterization study of forward emission from a thin, meso-structured silica
positron/positronium (Ps) converter following implantation of positrons in light of possible
antihydrogen production is presented. The target consisted of a∼ 1 μm thick ultraporous
silica film e-gun evaporated onto a 20 nm carbon foil. The Ps formation and emission was
studied via Single Shot Positron Annihilation Lifetime Spectroscopy measurements after
implantation of pulses with 3-4· 10 7 positrons and 10 ns temporal width. The forward …