Abstract
We examine the experimentally observed scaling patterns for particle production in nuclear collisions at sub-threshold energy regime in the framework of a cooperative model. Besides π+, K+, K− and [Formula: see text] we also include protons emitted at extreme kinematical region. We show that the proton spectra also has the same universal scaling behavior as that of pions, kaons and antiprotons. This supports our earlier proposition that the reaction mechanism leading to the emission of proton in extreme kinematical region is similar to the ones which cause sub-threshold particle productions.
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