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System-size and energy dependence of particle momentum spectra: The UrQMD analysis of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math>and Pb + Pb collisions
The ultrarelativistic quantum molecular dynamics (UrQMD) transport model is used to study a system-size and energy dependence of the pion production in high energy collisions. New data of the NA61/SHINE Collaboration on spectra of negatively charged pions in proton-proton interactions at Super Proton Synchrotron (SPS) energies are considered. These results …