MEASUREMENTS OF K-SHELL IONIZATION WITH XE-132 AND PB-208 PROJECTILES IN THE ENERGY-RANGE OF 1.4-5.9 MEV-U

Projectile and target K-shell ionization cross sections induced by 3.6-, 4.7-, and 5.9 MeV/u132Xe ions and 1.4-, 3.6-, 4.7-, and 5.9 MeV/u208Pb ions from the UNILAC in thin solid targets between C and U are measured. The cross sections are discussed in terms of the molecular model of innershell vacancy production in heavy ion-atom collisions. The sharing of 2 p1/2σ vacancies between the K shells of the two collision partners in these very heavy ion-atom collisions is found to deviate from the Meyerhof-Demkov formula for R≦10-2. The measured ionization cross sections are compared with theoretical calculations for 1 sσ and 2 p1/2σ excitation cross sections. A ZUA=Z1+Z2 dependence is found independent of Z1/Z2. Outer-shell vacancy configurations measured in these close encounters are reported. © 1979 Springer-Verlag.