Anomalies in the electronic stopping of slow antiprotons in LiF

Guerda Massillon-JL; Alfredo A. Correa; Xavier Andrade; Emilio Artacho

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arXiv · 2501.14381

Anomalies in the electronic stopping of slow antiprotons in LiF

Guerda Massillon-JL·Alfredo A. Correa·Xavier Andrade·Emilio Artacho

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Abstract

We present first-principles theoretical calculations for the electronic stopping power (SP) of both protons and anti-protons in LiF. Our results show the presence of the Barkas effect: a higher stopping for positively charged particles than their negatively charged antiparticles. In contrast, a previous study has predicted an anti-Barkas effect (higher stopping for negative charges) at low velocity [Qi, Bruneval and Maliyov, Phys. Rev. Lett. 128, 043401 (2022)]. We explain this discrepancy by showing that this anti-Barkas effect appears for highly symmetric trajectories and disappears when considering trajectories that better reproduce the experimental setup. Our low-velocity results show that the SP of both protons and anti-proton vanish for velocities under 0.1 a.u. .

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Guerda Massillon-JL, Alfredo A. Correa, Xavier Andrade, Emilio Artacho. 2025-01-24. Anomalies in the electronic stopping of slow antiprotons in LiF. https://arxiv.org/abs/2501.14381

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