Anomalies in the Electronic Stopping of Slow Antiprotons in LiF
Por:
Massillon-Jl G., Correa A.A., Andrade X., Artacho E.
Publicada:
1 ene 2025
Resumen:
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. © 2025 American Physical Society.
Filiaciones:
Massillon-Jl G.:
Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Correa A.A.:
Quantum Simulations Group, Lawrence Livermore National Laboratory, Livermore, 94550, CA, United States
Andrade X.:
Quantum Simulations Group, Lawrence Livermore National Laboratory, Livermore, 94550, CA, United States
Artacho E.:
CIC Nanogune, DIPC, Tolosa Hiribidea 76, San Sebastian, 20018, Spain
IKERBASQUE, Basque Foundation for Science, Bilbao, 48011, Spain
Cavendish Laboratory, University of Cambridge, J. J. Thomson Ave, Cambridge, CB3 0HE, United Kingdom
All Open Access; Green Open Access
|