Dynamical freeze-out phenomena: The case of K, φ transverse momentum spectra in collisions of Au(1.23 A GeV) + Au
Abstract
We argue on a continuous (dynamical) kinetic freeze-out of K, φ observed at midrapidity in collisions Au(1.23 A GeV) + Au. The simulations by means of a transport model of 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.
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