Abstract
We present the convergent close-coupling formulation for positron scattering from noble gases (Ne, Ar, Kr and Xe) within the single-center approximation. Target functions are described in a model of six p-electrons above an inert Hartree–Fock core with only one-electron excitations from the outer p6 shell allowed. Target states have been obtained using a Sturmian (Laguerre) basis in order to model coupling to ionization and positronium (Ps) formation channels. Such an approach is unable to yield explicit Ps-formation cross sections, but is valid below this threshold and above the ionization threshold. The present calculations are found to show good agreement with recent measurements.
Highlights
Detailed understanding of positron scattering from atoms, ions and molecules is a difficult task for both theory and experiment
The convergent CC (CCC) method has been extensively reviewed in our previous publications [39, 40]; here we present the relevant details of positron–noble gas scattering
We have performed CCC calculations of positron scattering from noble gases using CC expansions that are detailed in table 1
Summary
Detailed understanding of positron scattering from atoms, ions and molecules is a difficult task for both theory and experiment. The relative scarcity of positrons compared to electrons makes it harder to develop experimental techniques. While the absence of the exchange interaction makes the problem seemingly simpler, the addition of a new reaction channel, positronium (Ps) formation, brings a whole new set of problems. The development of more efficient positron sources led to renewed interest in positron–atom scattering. Detailed investigations by a number of groups have been performed on positron–helium scattering [1,2,3,4,5,6,7,8,9]. Elastic scattering differential cross sections have been measured at a number of energies for Kr and Xe [13, 14, 19]
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