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We argue for a continuous (dynamical) kinetic freeze-out of K ± , ϕ observed at midrapidity in collisions of Au(1.23 A GeV) + Au. The simulations, by means of a transport model of Boltzmann-Uhling-Uhlenbeck (BUU) type, point to time independent transverse momentum slope parameters after 20 fm/c. The complex interplay of expansion dynamics and strangeness production/exchange/absorption as well as elastic scatterings involved in the reaction network does not support the previous interpretation of a late freeze-out of K − due to larger cross sections.

Dynamical Freeze-Out Phenomena: The Case of K±, φ Transverse Momentum Spectra in Collisions of Au(1.23 A GeV) + Au