Recently, the search for deeply bound nuclear states with antikaons has attracted large interest. It was recently found  that the p+p reaction might be well suited for the production of (K − pp) nuclear bound states. We have proposed to perform an exclusive measurement using the FOPI detector  exploiting the reaction p+p at 3.5GeV and to build for this purpose a dedicated trigger device. The final state of the pp→(K − pp)K + → ΛpK + reaction involves Λ hyperons which can be detected using their decay into p + π − (64 % branching ratio). Thus, the FOPI detector has been extended by a Λ trigger system, in order to enrich events containing Λ candidates. The scheme of the Λ trigger (SIΛVIO – SIlicon Λ Vertexing and Identification Online) is shown in figure 1. It consists of two detector layers downstream of the target wit
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