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The production and properties of K + , K − and ϕ in nuclear reactions π − + A (A = C,W) at a beam momentum of 1:7 GeV/c has been studied with the HADES setup at SIS18/GSI. Of particular interest is the K − absorption in nuclear matter which should be driven by strangeness exchange processes on one (K − N → Yπ ) or more nucleons (K − NN → YNπ) . In this context, also the ϕ has to be taken into account, since ϕ decays into K+K − pairs may substantially affect the measured K − abundance. A solid reference is needed to evaluate the K − absorption with in the nucleus and in this work we discuss the determination of this reference. A double ratio of K − =K+(W)=K − =K+(C) is measured within the acceptance and compared to the reference.

Kaon and Phi Production in Pion-Nucleus Reactions at 1.7 GeV/c