The (${\pi }^{+}$,pd) reactions on ${}_{}{}^6{}_{}{}^{}$Li and ${}_{}{}^7{}_{}{}^{}$Li have been studied at $T_{\pi }$=59.4 MeV. Triple- and single-differential cross sections for these reactions are presented. The data are fitted to a T matrix and compared to the ${}_{}{}^3{}_{}{}^{}$H(${\pi }^{+}$,p${)}^2$H reaction. A model in which the pion interacts and is absorbed on a ‘‘quasi-triton’’ cluster describes the main features of the data very well. An extrapolation of our data into unmeasured regions of phase space suggests that about 8% of the pion absorption cross section on ${}_{}{}^6{}_{}{}^{}$Li at 59.4 MeV goes into the (${\pi }^{+}$,pd) channel. The ${}_{}{}^7{}_{}{}^{}$Li(${\pi }^{+}$,${\mathrm{p}\mathrm{d})}^4$He(2 ${}_{}{}^{\mathrm{-}}{}_{}{}^{}$) transition at 22.1 MeV excitation appears to be strongly populated. This is a surprise because it is not seen in the ${}_{}{}^7{}_{}{}^{}$Li(p,α${)}^4$He reaction.

• Received 26 December 1985

DOI:https://doi.org/10.1103/PhysRevC.33.1435