Positron scattering from water

Abstract

We report results of total cross section measurements for positron scattering from the chemically, environmentally and medically important molecule water. The present measurements were conducted over the energy range of 0.1–20 eV, with the cross section found to be strongly peaked at the lower energies. We believe these are only the second independent data to have been reported in the literature for this process and we note significant discrepancies with the earlier measurements in terms of the magnitude of the total cross section.