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K-shell ionization of thick targets of Ti, Fe, Ni, and Zn by 60-150-keV protons has been investigated. Experimental x-ray production cross sections have been determined as a function of proton energy. Absolute ionization cross sections are compared to predictions of the perturbed-stationary-state theory, including Coulomb deflection and approximate relativistic corrections (CPSSR). It is found that the CPSSR systematically overpredicts the values for the experimental data at the lower proton energies.
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Zander et al. (1979) studied this question.
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