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if-shell ionization cross sections have been measured at 2.04-MeV incident electron energy for 32 elements from V (Z~2Z) to Bi (Z = 83). Measured cross sections drop from a value of 353 b at V to 9.9 b at Bi. The general trend of the Z dependence of the cross sections is in agreement with theoretical predictions of Kolbenstvedt. However, variations in cross sections by as much as 30% from one element to the next are not accounted for by the theory.

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Excitation functions for a number of C 12 -, N 14 -, and 0 16 -induced reactions on aluminum-27 have been studied using stacked-foil techniques and the ion beams of the Yale Heavy Ion Accelerator. The yields of CI 34 -38 , P 32 , Al 28 -29 , Mg 27 , Na 24 , and F 18 have been measured in the energy range from 10.5 to about 1 Mev per nucleon. The production of the radionuclides Cl 34 > 38 , P 32 , and in the case of C 12 irradiation Al 28 , are due to evaporation processes from a compound-nucleus system, while the production of F 18 , Na 24 , Al 28 , Al 29 , and Mg 27 seems to occur by a direct-interaction mechanism. A comparison of the yields for specific radionuclei produced by different beams is given.