# Interaction of antiproton with helium based on ab-initio calculations

## TL;DR

This paper presents ab-initio calculations of ionization cross sections for antiproton-helium collisions at various energies, revealing the formation of an anti-cusp in the differential distributions.

## Contribution

It introduces a time-dependent coupled channel method with a finite basis set to model antiproton-helium interactions, providing new insights into ionization processes.

## Key findings

- Evidence of anti-cusp formation in differential distributions
- Ionization cross sections calculated at 10, 50, and 100 keV
- Use of a semiclassical approximation with Coulomb wave packets

## Abstract

We present ionization cross sections for antiproton and helium collisions based on ab-initio time-dependent coupled channel method. In our calculations a finite basis set of regular helium Coulomb wave packets and Slater function were used. The semiclassical approximation was applied with the time-dependent Coulomb potential to describe the antiproton electron interaction. Three different projectile energies were considered as 10, 50 and 100 keV. We found clear evidence for the formation of the anti-cusp in the differential distributions.