Ionization of helium by slow antiproton impact: total and differential cross sections
Abstract
We theoretically investigate the single and double ionization of the He atom by antiproton impact for projectile energies ranging from ~keV up to ~keV. We obtain accurate total cross sections by directly solving the fully correlated two-electron time-dependent Schr\"odinger equation and by performing classical trajectory Monte-Carlo calculations. The obtained quantum-mechanical results are in excellent agreement with the available experimental data. Along with the total cross sections, we also present the first fully \textit{ab initio} doubly differential data for single ionization at 10 and 100~keV impact energies. In these differential cross sections we identify the binary-encounter peak along with the anticusp minimum. Furthermore, we also point out the importance of the post-collisional electron-projectile interaction at low antiproton energies which significantly suppresses electron emission in the forward direction.
Keywords
Cite
@article{arxiv.1409.1379,
title = {Ionization of helium by slow antiproton impact: total and differential cross sections},
author = {S. Borbély and J. Feist and S. Nagele and K. Tőkési and L. Nagy and J. Burgdörfer},
journal= {arXiv preprint arXiv:1409.1379},
year = {2015}
}