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We discuss the $\sqrt{s}$-dependence of the $K^+/\pi^+$ ratio in heavy-ioncollisions (the "horn" effect) within a Mott-Anderson localization model forchemical freeze-out. The different response of pion and kaon radii to the hotand dense hadronic medium results in different freeze-out conditions. Wedemonstrate within a simple model that this circumstance enhances the "horn"effect relative to statistical models with universal chemical freeze-out.

Mott-Anderson freeze-out and the strange matter "horn"