Antiproton-deuteron annihilation intoΛ+anything below 1 GeV/c

We present data on $\Lambda$ production from two experiments in which the ANL 12-foot and the BNL 30-inch deuterium-filled bubble chambers were exposed to antiproton beams from 550 to 900 MeV/c. Some features of the data are compared to calculations of double scattering using $\overline{K}$ and $\overline{\Lambda }$ as the exchanged particles. The $\Lambda$ final states in our experiments exhibit behavior which suggests that a double-scattering mechanism with a $\overline{K}$ exchanged between the two nucleons is the most likely candidate for the $\Lambda$ production mechanism. The data are compared with two other experiments in which $\Lambda$ events are produced above the $\overline{p}d\to \overline{\Lambda }\Lambda N$ threshold. A test of isospin invariance in these reactions is also reported.