We have measured the cross section of the ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$${(}^6$Li${,}^8$He${)}^{25}$Si reaction. At a scattering angle of 5.5° and a beam energy of 92.5 MeV, we find the laboratory cross section to populate the ${}_{}{}^{25}{}_{}{}^{}\mathrm{Si}$ ground state doublet to be 3.6±1.0 nb/sr and the cross section to populate the 0.82 MeV second excited state to be ≊200 pb/sr. We also measured the ${(}^6$Li${,}^8$He) reaction for ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$ and ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ targets. We find yields of ≊250 pb/sr and <300 pb/sr, respectively. This experiment represents the first observation of the ${(}^6$Li${,}^8$He) exotic nuclear reaction.

• Received 18 February 1988

DOI:https://doi.org/10.1103/PhysRevC.37.2889