TY - JOUR
T1 - Excitation of Sn K- and L- and Ta L-shell x rays by 1.4-4.4-MeV protons
AU - Ishii, K.
AU - Morita, S.
AU - Tawara, H.
AU - Kaji, H.
AU - Shiokawa, T.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1974
Y1 - 1974
N2 - Excitation functions and absolute cross sections for Sn K- and L-shell and Ta L-shell x-ray production by proton impact have been measured over the energy range 1.4-4.4 MeV with a Si(Li) detector. The results, combined with our measurements on other elements, are compared with existing theories. In the calculation of ionization cross sections from the plane-wave Born approximation, we discuss the effect of a relativistic correction for the ionization potential. The plane-wave Born approximation with the correction due to the Coulomb deflection gives the best fit for Sn K x-ray production and the binary-encounter approximation is the best for Sn L and Ta L x-ray production. The semiclassical approximation based on the impact-parameter treatment predicts values which are not in agreement with the data on Sn L x rays. The scaled universal excitation curve based on the binary-encounter approximation gives good fits to K-shell ionizations but seems to show some disagreement for L-shell ionizations. The dependence of the K K ratio of Sn on the target thickness was investigated but it was found that the ratio is constant within the experimental uncertainty. Relative intensities for the transitions L , L , L, and Ll are also compared with the theories.
AB - Excitation functions and absolute cross sections for Sn K- and L-shell and Ta L-shell x-ray production by proton impact have been measured over the energy range 1.4-4.4 MeV with a Si(Li) detector. The results, combined with our measurements on other elements, are compared with existing theories. In the calculation of ionization cross sections from the plane-wave Born approximation, we discuss the effect of a relativistic correction for the ionization potential. The plane-wave Born approximation with the correction due to the Coulomb deflection gives the best fit for Sn K x-ray production and the binary-encounter approximation is the best for Sn L and Ta L x-ray production. The semiclassical approximation based on the impact-parameter treatment predicts values which are not in agreement with the data on Sn L x rays. The scaled universal excitation curve based on the binary-encounter approximation gives good fits to K-shell ionizations but seems to show some disagreement for L-shell ionizations. The dependence of the K K ratio of Sn on the target thickness was investigated but it was found that the ratio is constant within the experimental uncertainty. Relative intensities for the transitions L , L , L, and Ll are also compared with the theories.
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U2 - 10.1103/PhysRevA.10.774
DO - 10.1103/PhysRevA.10.774
M3 - Article
AN - SCOPUS:4243809910
VL - 10
SP - 774
EP - 780
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
SN - 1050-2947
IS - 3
ER -