Abstract
Abstract Cross sections for the production of K- and L-shell vacancies by α-particles have been determined from measurements of K X-ray yields from thin targets of Fe, Ni, Cu, Zr, Nb, Rh, Pd, Ag and Sn and L X-ray yields from thin targets of Sn, Tm, Ta and Au. The measurements were carried out at the α-particle energies of 30, 40, 50, 60, 70 and 80 MeV using a Si(Li) semi-conductor X-ray spectrometer. In general, the α-particle ionization cross sections were found to be consistent with available proton ionization cross-section data although systematic differences have been observed. The experimental excitation functions were compared with the theoretical excitation functions based upon the Born approximation and found to rise more steeply than predicted, thus giving cross sections that are larger than the theoretical values.
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