Excitation Functions of Some Reactions of 6- to 24-MeVHe3Ions with Carbon and Aluminum

Abstract

Excitation functions of the reactions ${\mathrm{C}}^{12}({\mathrm{He}}^3, \alpha ){\mathrm{C}}^{11}$, ${\mathrm{C}}^{12}({\mathrm{He}}^3, pn){\mathrm{N}}^{13}$, ${\mathrm{C}}^{12}({\mathrm{He}}^3, 2\alpha ){\mathrm{Be}}^7$, ${\mathrm{Al}}^{27}({\mathrm{He}}^3, \alpha 2p){\mathrm{Na}}^{24}$, ${\mathrm{Al}}^{27}({\mathrm{He}}^3, 2\alpha ){\mathrm{Na}}^{22}$, and ${\mathrm{Al}}^{27}({\mathrm{He}}^3, 3\alpha ){\mathrm{F}}^{18}$ have been measured for ${\mathrm{He}}^3$ energies from 6 to 24 MeV by the stackedfoil technique. The cross section for production of ${\mathrm{C}}^{11}$ reaches a maximum of 340 mb at 8.9 MeV, with smaller maxima at 10.6 and 15.5 MeV. The cross section for ${\mathrm{N}}^{13}$ reaches a broad maximum of 140 mb in the vicinity of 14 MeV, with evidence of a secondary maximum at 10.9 MeV. The cross section for ${\mathrm{Be}}^7$, measured with somewhat poorer resolution, reaches a broad maximum of about 100 mb in the vicinity of 17.5 MeV. The cross section for production of ${\mathrm{Be}}^7$ by 24-MeV ${\mathrm{He}}^3$ bombardment of aluminum is about 0.1 mb.