L X-RAY-PRODUCTION CROSS-SECTIONS OF MEDIUM Z-ELEMENTS BY HE-4 ION IMPACT

L X-ray production cross sections for 500, 600, 800 and 1000 keV He-4 ions incident upon Ag-47, In-49, Sn-50, Sb-51, Te-52, and Ce-58 target s are reported. Commercially available evaporated thin metal foils wit h thicknesses ranging between 45 and 160 mu g/cm(2) were used. The exp erimental values of L X-ray production cross sections are compared to the predictions of the first Born and ECPSSR theories. The first Born approximation overpredicts the experimental values of all measured pro duction cross sections for all elements and energies. ECPSSR theory un derpredicts L alpha, L beta and L gamma(1.5) production cross sections for all elements except for Ce. Discrepancy is clearly larger at lowe r ion energies. On the other hand L gamma(2.3) is generally in good ag reement with the ECPSSR theory. Only a very limited number of data for the same elements and energies as measured in this work are found in literature and compared with our values. (C) 1998 Elsevier Science B.V .