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Artículo

Energy loss of protons in Wolframiun using fully relativistic binding energies and wave functions, and mean excitation energies of W, Au, Pb and Bi

Montanari, Claudia CarmenIcon ; Mitnik, Dario MarceloIcon ; Archubi, Claudio DaríoIcon ; Miraglia, Jorge EstebanIcon
Fecha de publicación: 12/2009
Editorial: American Physical Society
Revista: Physical Review A: Atomic, Molecular and Optical Physics
ISSN: 1050-2947
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Físicas

Resumen

We present a theoretical study on the energy loss of protons in wolframium by calculating target fully relativistic wave functions and binding energies. The HULLAC code is employed to obtain numerical solutions of the Dirac equation. We use the shellwise local plasma approximation SLPA to evaluate the different moments of the energy loss. The partial contribution of each subshell of target electrons is calculated separately, including the screening among the electrons of the same binding energy. We pay special attention to the role of the outer 4f shell and the screening between electrons of near subshells i.e., the 5p and 4f electrons. Results for stopping and straggling cross sections are compared to the experimental data available. Our calculations describe rather well the stopping measurements around the maximum and for very high energies, but overestimate the data for impact energies around 1 MeV. We find that the SLPA results tend clearly to Bethe limit, but show a systematic overestimation in the energy region of 1 - 2 MeV. This overestimation may indicate the presence of other mechanisms included neither in the SLPA nor in Bethe formulations. We also present results for the stopping number of W, Au, Pb, and Bi which follow quite well the Lindhard scaling. A theoretical mean excitation energy IW=710 eV is obtained, in good agreement with the suggested value of 727.30 eV. Theoretical mean excitation energies for Au, Pb, and Bi are also presented, which are in good agreement with the experimental ones.
Palabras clave: Wolframium , Energy-Loss , Fully-Relativistic , Local-Plasma-Approximation
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/25056
DOI: http://dx.doi.org/10.1103/PhysRevA.80.012901
URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.80.012901
Colecciones
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Montanari, Claudia Carmen; Mitnik, Dario Marcelo; Archubi, Claudio Darío; Miraglia, Jorge Esteban; Energy loss of protons in Wolframiun using fully relativistic binding energies and wave functions, and mean excitation energies of W, Au, Pb and Bi; American Physical Society; Physical Review A: Atomic, Molecular and Optical Physics; 80; 1; 12-2009; 1-6; 012901
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