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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental and theoretical cross sections for K-shell ionization of Te-52, Ta-73, and Bi-83 by electrons with energies up to 100 keV

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Author(s):
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Santos, O. C. B. [1] ; Vanin, V. R. [1] ; Maidana, N. L. [1] ; Martins, M. N. [1] ; Tabacniks, M. H. [1] ; Rodrigues, C. L. [1] ; Silva, T. F. [1] ; Santos, A. D. [1] ; Barros, S. F. [2] ; Garcia-Alvarez, J. A. [3] ; Koskinas, M. F. [4] ; Fernandez-Varea, J. M. [5, 6] ; Pindzola, M. S. [7]
Total Authors: 13
Affiliation:
[1] Univ Sao Paulo, Inst Fis, Rua Matao 1371, Cidade Univ, BR-05508090 Sao Paulo - Brazil
[2] Inst Fed Sao Paulo, Rua Primeiro Maio 500, BR-08571050 Sao Paulo - Brazil
[3] Coll Southern Nevada, Phys Sci Dept, 6375 West Charleston Blvd, Las Vegas, NV 89146 - USA
[4] CNEN SP, Inst Pesquisas Energet & Nucl, Ave Lineu Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo - Brazil
[5] Univ Barcelona, Fac Fis, Dept Fis Quant & Astrofis, Diagonal 645, E-08028 Barcelona, Catalonia - Spain
[6] Univ Barcelona, Fac Fis, Inst Ciencies Cosmos, Diagonal 645, E-08028 Barcelona, Catalonia - Spain
[7] Auburn Univ, Dept Phys, Auburn, AL 36849 - USA
Total Affiliations: 7
Document type: Journal article
Source: Physical Review A; v. 100, n. 2 AUG 7 2019.
Web of Science Citations: 1
Abstract

In this work we present a combined experimental and theoretical study of K-shell ionization by electrons with energies close to the threshold. The ionization cross sections of the K shells of Te, Ta, and Bi atoms have been measured up to 100 keV with uncertainties ranging from 4% to 8%. In turn, calculations have been done using the subconfiguration average distorted-wave (SCADW) method, which includes the full two-body retarded electromagnetic interaction between the projectile and target electrons. The predictions of the SCADW method are in good agreement with the experimental data. In contrast, theoretical cross sections based on first-order perturbation theory where the transverse interaction is computed with plane waves instead of distorted waves underestimate the SCADW values as well as the experimental data. The difference between the two investigated ab initio formalisms grows with atomic number, being 3% for Te, 15% for Ta, and 25% for Bi. An additional comparison of both theoretical approaches with recent measurements for Au K supports the conclusion that the SCADW method reproduces well the experimental K-shell ionization cross section of atoms with intermediate to large Z near the threshold. (AU)

FAPESP's process: 15/14530-7 - Inner shell atomic ionization by impact of electrons with energy between 10 keV and 5 MeV in the São Paulo Microtron
Grantee:Vito Roberto Vanin
Support type: Regular Research Grants