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12 papers · 2 filters
Calculations of positronium-atom scattering using a spherical cavity
A. R. Swann, G. F. Gribakin
Positronium (Ps) scattering by noble-gas atoms (He, Ne, Ar, Kr, and Xe) is studied in the frozen-target approximation and with inclusion of the van der Waals interaction. Single-pa…
Mode coupling and multiquantum vibrational excitations in Feshbach-resonant positron annihilation in molecules
G. F. Gribakin, J. F. Stanton, J. R. Danielson +2
The dominant mechanism of low-energy positron annihilation in polyatomic molecules is through positron capture in vibrational Feshbach resonances (VFR). In this paper we investigat…
Photoionisation of Ca ions in the valence-energy region 20eV~--~56eV : experiment and theory
A Mueller, S Schippers, R A Phaneuf +8
Relative cross sections for the valence shell photoionisation (PI) of ground level and metastable Ca ions were measured with high energy resolution by usi…
Vibrational Feshbach Resonances Mediated by Nondipole Positron-Molecule Interactions
M. R. Natisin, J. R. Danielson, G. F. Gribakin +2
Measurements of energy-resolved positron-molecule annihilation show the existence of positron binding and vibrational Feshbach resonances. The existing theory describes this phenom…
Positron cooling and annihilation in noble gases
D. G. Green
Understanding the dynamics of positron cooling in gases, including the fraction of positrons surviving to thermalisation, is critical for accurate interpretation of positron lifeti…
Probing positron cooling in noble gases via annihilation spectra
D. G. Green
spectra for positron annihilation in noble-gas atoms are calculated using many-body theory for positron momenta up to the positronium-formation threshold. This data is used, to…