IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Low- and intermediate-energy stopping power of protons and antiprotons in solid targets
Autor/es:
C.C. MONTANARI; J. E. MIRAGLIA
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: Nueva york; Año: 2017 vol. 96 p. 12707 - 1270712
ISSN:
1050-2947
Resumen:
In this paper we propose a nonperturbative approximation to electronic stopping power based on the centralscreened potential of a projectile moving in a free-electron gas, by Nagy and Apagyi [Phys. Rev. A 58, R1653(1998)]. 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 Wigner-Seitzradius, rs = 1.48 to 5.31, which cover most of the possible metallic solids. Present low-velocity results agree wellwith the experimental data for both proton and antiproton impact. Our formalism describes the binary collision ofthe projectile and one electron of the free-electron gas. It does not include the collective or plasmon excitations,which are important in the intermediate- and high-velocity regime. The distinguishing feature of this contributionis that by using the present model for low to intermediate energies and the Lindhard dielectric formalism forintermediate to high energies, we describe the stopping due to free-electron gas in an extensive energy range.Moreover, by adding the inner-shell contribution using the shellwise local plasma approximation, we are able todescribe all the available experimental data in the low-, intermediate-, and high-energy regions.