Nuclear Reactions with 21-MevHe3in a Cyclotron

${\mathrm{He}}^3$ ions were accelerated to a maximum energy of 21 Mev. Bombardment of Be, C, O, and Ni led to numerous known activities. The relative cross sections of the ${\mathrm{He}}^3$ reactions involving O and Ni nuclei are evaluated. The half-lives of ${\mathrm{C}}^{11}$ and ${\mathrm{Zn}}^{62}$ were found to be 20.74±0.10 minutes and 8.4±0.2 hours, respectively.