Using the large acceptance apparatus FOPI, we study central collisions in the reactions (energies in A GeV are given in parentheses): 40 Ca+ 40 ). The observables include cluster multiplicities, longitudinal and transverse rapidity distributions and stopping, and radial flow. The data are compared to earlier data where possible and to transport model simulations.

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The incident energy at which the azimuthal distributions in semi-central heavy ion collisions change from in-plane to out-of-plane enhancement -E tran is studied as a function of mass of emitted particles, their transverse momentum and centrality for Au+Au collisions. The analysis is performed in a reference frame rotated with the sidewards flow angle (Θ f low ) relative to the beam axis.A systematic decrease of E tran as function of mass of the reaction products, their transverse momentum and collision centrality is evidenced.The predictions of a microscopic transport model (IQMD) are compared with the experimental results.