K-K transfer cross sections for 50-165 MeV Cu ions incident on Cu targets

Thin self-supporting Cu targets in 11-250 μg/cm2 thickness were bombarded with 50-165 MeV Cu sup(qi+) ions (7 <= qi <= 24) to investigate the target thickness dependence of inner shell vacancy production process both in the projectile and the target. In the region of equilibrium, mean K-vacancy production cross sections of projectile and target attain constant values within experimental errors and the ratios of these cross sections are about 1.3 for all the collision combinations. K-K transfer cross sections Q sub(kk) have been derived in numerical procedure from these K-vacancy production cross sections. The Q sub(kk) values slowly decrease with the increase of projectile energy. This trend is quite similar to the calculated cross sections based on OBK. The Q sub(kk) derived from OBK is 30 times as much as that derived from experimental value. On the other hand, Gray et al. estimated the Q sub(kk) value from the standpoint of molecular picture, which becomes to be 1.8 x 10-18 cm2. Thus calculated value is constant regardless of the projectile energy, but it's magnitude seems to be consistent with the experimentally extracted values. (author)