Study of Two-Step Mechanisms in Pion Absorption on 6Li, 12C via Deuteron   Emission
  The (pi+,pd), and (pi+,dd) reactions were investigated with pions of 100 and 165 MeV kinetic energy on 6Li and 12C targets. In comparison with previously published (pi+,pp) data on the same targets and at the same beam energies, kinematic regions were identified in which the neutron pickup process n+p->d dominated the observed deuteron yield. The importance of this mechanism increases with energy, contributing half of the observed cross section at 165 MeV. The contribution of direct quasi-triton absorption is significant only at 100 MeV. 
G.M. Huber, G.J. Lolos, Z. Papandreou, J. Hovdebo, S.I.H. Naqvi, D.F.   Ottewell, P.L. Walden, G. Jones, X. Aslanoglou