Theoretical study on positron scattering by benzene over a broad energy range

Authors

Alessandra Souza Barbosa, Federal University of Parana
Francisco Blanco, Complutense University of Madrid
Gustavo Garcia, Superior Council of Scientific Investigations, University of WollongongFollow
Marcio H. F. Bettega, Federal University of Parana

RIS ID

139613

Publication Details

Barbosa, A. Souza., Blanco, F., Garcia , G. & Bettega, M. H. F. (2019). Theoretical study on positron scattering by benzene over a broad energy range. Physical Review A, 100 (4), 042705-1-042705-7.

Abstract

In this paper two theoretical methodologies, the Schwinger multichannel (SMC) method and the independent atom model with the screening corrected additivity rule (IAM-SCAR), were employed to study positron scattering by benzene over a broad impact energy range. The SMC calculations were carried out in the static plus polarization approximation, accounting for the elastic channel, for impact energies up to 20 eV. The IAM-SCAR method covered energies up to 1000 eV to provide total, elastic, ionization, excitation, and positronium formation cross sections. In the low-energy region we discuss how the description of the polarization effects affects the cross sections. In particular, our calculations support the existence of a bound state in the positron scattering by benzene, in agreement with previous predictions by Young and Surko [Phys. Rev. A 77, 052704 (2008)NIMBEU0168-583X10.1103/PhysRevA.77.052704].