The reactions iTp -> AK°, X°K°, and 2~K + in the 1.5-to 4.2-BeV/c momentum range were studied in the Lawrence Radiation Laboratory's 72-in. hydrogen bubble chamber. The total cross sections for the three reactions decrease as E 0 . m ." s ' 6 , £ c .m.~3" 3 , and Ec.m." 9,3 , respectively. The differential cross sections are presented at 11 beam momenta. A peripheral peak is the dominant feature of the reactions ir~~p -> AK° and 2°i£ 0 , for which K* exchange is allowed, but no such peaking is seen in ir~p -> 2)~~K + . An exponential fit to the momentum-transfer distributions in the peripheral region yields slope parameters in the 6-to 10~(BeV/c)~2 range. The differential cross sections for w~p -> AK Q and 2~K + show peaking for forward production of hyperons in the cm. system, to which baryon exchange is expected to contribute. The angular distribution of the A polarization in tCp -> AK° is presented.
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