L-Shell X-Ray Production Cross Sections in Nd, Gd, Ho, Yb, Au and Pb for 25-MeV Carbon and 32-MeV Oxygen Ions

摘要

L-shell x-ray production cross sections in sub 60 Nd, sub 64 Gd, sub 67 Ho, sub 70 Yb, sub 79 Au and sub 82 Pb have been measured for incident 25 MeV sub 612 C/sup +q/(q = 4,5,6) and 32 MeV sub 816 O/sup +q/(q = 5,7,8) ions. Measurements were made on targets ranging in thickness from 1 to 100 mu g/cm exp 2 . Echancement in the L-shell x-ray production cross section for projectiles with one or two K-shell vacancies over those for projectiles with no K-shell vacancies is observed. The sum of direct ionization to the continuum (DI) plus electron capture (EC) to the L,M,N ... shells and EC to the K-shell of the projectile have been extracted from the data. Calculations in the first Born approximation are approx. 10 times larger than the data. Predictions of the ECPSSR theory that accounts for the energy-loss, Coulomb deflection, perturbed-stationary state, and relativistic effects are in good agreement with the data for both ions. (ERA citation 10:017331)