Abstract
The K-shell ionisation induced by 7-15 MeV proton bombardment on thin targets of Ag, Gd, Yb, Ta, Au, Pb and Th has been measured. The data are corrected for the contribution of the 'nuclear satellites' produced by internal conversion in the residual nuclei from (p,xn) reactions. The plane-wave Born approximation (PWBA) explains the data only up to Yb. For heavier elements, only the binary-encounter approximation (BEA) and the semiclassical approximation (SCA) including relativistic effects are in overall agreement with the experiment. A comparison with the existing alpha-particle ionisation cross sections at equal velocities shows the presence of increased electron binding due to the finite projectile charge.
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