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Anomalies in the Electronic Stopping of Slow Antiprotons in LiF
Guerda Massillon-Jl1, Alfredo A Correa2, Xavier Andrade2
1Universidad Nacional Autónoma de Mexico, Instituto de Física, 04510 Mexico City, Mexico.
Abstract:
We present first-principles theoretical calculations for the electronic stopping power (SP) of both protons and antiprotons 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)PRLTAO0031-900710.1103/PhysRevLett.128.043401]. 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 antiproton vanish for velocities under 0.1 a.u.
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