Low and intermediate energy stopping power of protons and antiprotons in canonical targets

Abstract

In this work we propose a non-perturbative approximation to the electronic stopping power based on the central screened potential of a projectile moving in a free electron gas, by Nagy and Apagyi. We used this model to evaluate the energy loss of protons and antiprotons in ten solid targets: Cr, C, Ni, Be, Ti, Si, Al, Ge, Pb, Li and Rb. They were chosen as canonicals because they have reliable values of the Seitz radio, rS=1.48-5.31 a.u., which cover most of the possible metallic solids. Present low velocity results agree well with the experimental data for both proton and antiproton impact. Our formalism describes the binary collision of the projectile and one electron of the free electron gas. It does not include the collective or plasmon excitations, which are important in the intermediate to high velocity regime. The distinguishing feature of this contribution is that by using the present model for low to intermediate energies (below the appearance of plasmon excitations), the Lindhard dielectric formalism (including plasmons) for intermediate to high energies, and the shellwise local plasma approximation to account for the inner shell contribution, then a good full-theoretical description of the available experimental data is obtained in an extensive energy range, covering the low, intermediate and high energy region.

13 pages including 8 figures

References in corpus (5)

• Electronic stopping power in gold: The role of d electrons and the H/He anomaly
• Electronic stopping power in a narrow band gap semiconductor from first principles
• Electronic Stopping of Slow Protons in Transition and Rare Earth Metals: Breakdown of the Free Electron Gas Concept
• Stopping of 0.3 - 1.2 MeV/u protons and alpha particles in Si
• Dynamic screening of an ion in a degenerate electron gas within the second-order Born approximation

Cited by in corpus (4)

• Structural characteristics of strongly coupled ions in a dense quantum plasma
• Energy loss and friction characteristics of electrons at warm dense matter and non-ideal dense plasma conditions
• Significance of high charge state of projectile ions inside the target and its role on electron capture leading to target ionization phenomenon
• Swift charged particles in a degenerate electron gas: An estimation for the Barkas effect in stopping