K-shell ionization of elements P15 to Ni28 for 0.4 to 3.8 MeV/amu B510-ion bombardment

G. Monigold, F. D. McDaniel, J. L. Duggan, R. Rice, A. Toten, R. Mehta, and P. D. Miller
Phys. Rev. A 18, 380 – Published 1 August 1978
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Abstract

K-shell x-ray production cross sections, KβKα x-ray intensity ratios and Kα and Kβ x-ray energy shifts have been determined for thin solid targets of P15, K19, Ca20, Sc21, Ti22, V23, Mn25, Fe26, Co27, and Ni28 for 4-38-MeV B510 ion bombardment. Comparisons of the cross sections were made to direct Coulomb ionization and electron-capture theories by means of fluorescence yields corrected for multiple-ionization effects. The dominant contribution to K-vacancy production for these projectile-target combinations is believed to be direct ionization. Electron capture is expected to be important only for the lighter target elements and then primarily at the higher velocities. The direct-ionization theories employed were the binary-encounter approximation and the plane-wave Born approximation (PWBA) both of which overestimated the experimental data especially at the lower incident ion velocities. The PWBA was modified for increased target-electron binding, Coulomb deflection of the incident ion, polarization of the target-electron wave functions due to the passage of the incident ion, and relativistic target-electron velocities. The experimental data were found to agree quite well with the sum of the theoretical predictions of the modified PWBA and electron capture.

  • Received 27 December 1977

DOI:https://doi.org/10.1103/PhysRevA.18.380

©1978 American Physical Society

Authors & Affiliations

G. Monigold*, F. D. McDaniel, J. L. Duggan, R. Rice, A. Toten, and R. Mehta

  • Department of Physics, North Texas State University, Denton, Texas 76203

P. D. Miller

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee

  • *Present address: Directorate of Combat Development, United States Army Field Artillery School, Ft. Sill, Okla. 73503.

Comments & Replies

K-shell ionization of elements Cu29 to Rb37 for 0.4-3.8-MeV/amu B510-ion bombardment

R. Mehta, F. D. McDaniel, J. L. Duggan, and P. D. Miller
Phys. Rev. A 19, 1363 (1979)

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Vol. 18, Iss. 2 — August 1978

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