Excitation Functions for Lithium-6 Induced Reactions on Aluminum-27

Excitation functions for a number of ${\mathrm{Li}}^6$-induced reactions on ${\mathrm{Al}}^{27}$ have been studied using stacked foil techniques and the ${\mathrm{Li}}^6$ ion beam from the Yale Heavy Ion Accelerator. Excitation functions corresponding to radioactive residual nuclei ${\mathrm{P}}^{32}$, ${\mathrm{P}}^{30}$, ${\mathrm{Si}}^{31}$, ${\mathrm{Al}}^{29}$, ${\mathrm{Al}}^{28}$, ${\mathrm{Mg}}^{27}$, ${\mathrm{Na}}^{24}$, and ${\mathrm{Na}}^{22}$ have been measured in the ${\mathrm{Li}}^6$ energy range from 1 to 63.3 Mev. The data strongly suggest that the ${\mathrm{P}}^{32}$, ${\mathrm{P}}^{30}$, and ${\mathrm{Si}}^{31}$ result from compound system processes and the ${\mathrm{Na}}^{22}$ and ${\mathrm{Na}}^{24}$ from a predominant direct knockout process. In the cases of ${\mathrm{Al}}^{28}$ and ${\mathrm{Al}}^{29}$ both compound system and direct pickup reaction amplitudes contribute to the reaction yield.