Excitation Functions for Heavy-Ion-Induced Reactions on Aluminum-27

Excitation functions for a number of ${\mathrm{C}}^{12}$-, ${\mathrm{N}}^{14}$-, and ${\mathrm{O}}^{16}$-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 ${\mathrm{Cl}}^{34,38}$, ${\mathrm{P}}^{32}$, ${\mathrm{Al}}^{28,29}$, ${\mathrm{Mg}}^{27}$, ${\mathrm{Na}}^{24}$, and ${\mathrm{F}}^{18}$ have been measured in the energy range from 10.5 to about 1 Mev per nucleon. The production of the radionuclides ${\mathrm{Cl}}^{34,38}$, ${\mathrm{P}}^{32}$, and in the case of ${\mathrm{C}}^{12}$ irradiation ${\mathrm{Al}}^{28}$, are due to evaporation processes from a compound-nucleus system, while the production of ${\mathrm{F}}^{18}$, ${\mathrm{Na}}^{24}$, ${\mathrm{Al}}^{28}$, ${\mathrm{Al}}^{29}$, and ${\mathrm{Mg}}^{27}$ seems to occur by a direct-interaction mechanism. A comparison of the yields for specific radionuclei produced by different beams is given.