https://doi.org/10.1140/epjd/s10053-025-01008-8
Regular Article - Atomic and Molecular Collisions
Electron capture and ionisation in intermediate-energy C
He collisions: Integrated cross sections
1
Department of Physics and Astronomy, Curtin University, GPO Box U1987, 6845, Perth, WA, Australia
2
Department of Applied Mathematics, Tashkent State University of Economics, 100066, Tashkent, Uzbekistan
3
Institute of Nuclear Physics, 100214, Tashkent, Uzbekistan
a
kyna.schrick@student.curtin.edu.au
Received:
23
January
2025
Accepted:
7
May
2025
Published online:
24
May
2025
Integrated cross sections for total and state-selective electron capture, and ionisation in CHe collisions are calculated using the two-centre four-body wave-packet convergent close-coupling method for projectile energies ranging from 2 keV/u to 3 MeV/u. The two-electron target structure accounts for electron-electron correlation effects, as well as electron exchange in the rearrangement C
He
channels, which become important at low and intermediate energies. Also used for comparison is an alternative approach that reduces the He target to an effective one-electron system. For electron capture, both methods display good agreement with experiments at high impact energies. For low impact energies the two-electron method performs well, however, the effective single-electron model overestimates available experimental data. Generally good agreement with experiment is found for ionisation cross sections for projectile energies greater than 100 keV/u with both methods. The effective single-electron method is extended down to 10 keV/u, however it overestimates low-energy experiments. It is concluded that the two-electron target description is necessary to correctly model electron capture in the entire range of incident collision energies considered in this work.
© The Author(s) 2025
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.