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Anomalies in the electronic stopping of slow antiprotons in LiF

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arxiv 2501.14381 v1 pith:63GFOSAW submitted 2025-01-24 cond-mat.other

Guerda Massillon-JL , Alfredo A. Correa , Xavier Andrade , Emilio Artacho This is my paper · ORCID
classification cond-mat.other
keywords stoppingeffectanti-barkaschargedelectronichigherprotonsresults
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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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  1. Comment on 'Anomalies in the Electronic Stopping of Slow Antiprotons in LiF', arXiv:2501.14381

    cond-mat.other 2025-04 conditional novelty 4.0 of 10

    A re-analysis of slow antiproton stopping in LiF says the PRL134 results deviate from experiment by up to a factor of three and proposes the Adiabatic Ionization Model instead.

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