Abstract
Total and positronium formation cross sections have been measured for positron scattering from H2O and HCOOH using a positron beam with an energy resolution of 60 meV (full-width at half-maximum (FWHM)). The energy range covered is 0.5–60 eV, including an investigation of the behavior of the onset of the positronium formation channel using measurements with a 50 meV energy step, the result of which shows no evidence of any channel coupling effects or scattering resonances for either molecule.
Highlights
Of positronium (Ps) formation, a critical reaction channel for PET, are likely to be critical in the development of such a dosimetry
We report measurements of 0.5–60 eV grand total cross sections (GTCS) and Ps formation cross sections (QPs) for positron scattering from H2O and HCOOH
The order of the discussion that follows is that the GTCS, GTCS − QPs and QPs results are presented for each molecule separately, in comparison with data from the literature
Summary
Of positronium (Ps) formation, a critical reaction channel for PET, are likely to be critical in the development of such a dosimetry. We report measurements of 0.5–60 eV GTCS and Ps formation cross sections (QPs) for positron scattering from H2O and HCOOH These measurements were carried out at the Australian Positron Beamline Facility [20], using an energy resolution of ∼60 meV. Because of this superior energy resolution, we have carried out high precision measurements to investigate threshold effects in the Ps formation and ionization channels, as well as a search for positron scattering resonances
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