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We study the details and time dependence of particle production in nuclearcollisions at a fixed target beam energy of $E_{\mathrm{lab}}= 1.76$ A GeV withthe UrQMD transport model. We find that the previously proposed productionmechanism for multi strange hadrons, $\phi$ and $\Xi$, are possible due tosecondary interactions of incoming nuclei of the projectile and target withalready created nuclear resonances, while the Fermi momenta of the nuclei playonly a minor role. We also show how the centrality dependence of these particlemultiplicities can be used to confirm the proposed mechanism, as it stronglydepends on the number of participants in the reaction. Furthermore weinvestigate the time dependence of particle production in collisions of Ca+Caat this beam energy, in order to understand the origins of the apparentchemical equilibration of the measured particle yields. We find that indeed thelight hadron yields appear to be in equilibrium already from the very earlystage of the collision while in fact no local equilibration, through multicollision processes, takes place. The apparent equilibrium is reached onlythrough the decay of the resonances according to available phase space.

Heavy baryonic resonances, multistrange hadrons, and equilibration at energies available at the GSI Schwerionensynchrotron, SIS18