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Decoupling of non-strange, strange and multi-strange particles from
the system in Cu–Cu, Au–Au and Pb–Pb collisions at high energies

Muhammad Waqas, G.X. Peng, Muhammad Ajaz, Zafar Wazir,
Published in Elsevier
2022
Volume: 77
   
Pages: 1713 - 1722
Abstract

Transverse momentum spectra of the non-strange, strange and multi-strange particles in central
and peripheral Copper–Copper, Gold–Gold and Lead–Lead collisions are analyzed by the
blast wave model with Boltzmann Gibbs statistics. The model results are approximately in
agreement with the experimental data measured by BRAHMS, STAR, SPS, NA 49 and WA
97 Collaborations in special transverse momentum ranges. Bulk properties in terms of kinetic
freeze-out temperature, transverse flow velocity and freeze-out volume are extracted from the
transverse momentum spectra of the particles. Separate freeze-out temperature is observed for
the non-strange, strange and multi-strange particles which may be due to different reaction
cross-section of the interacting particles and it reveals the triple kinetic freeze-out scenario in
collisions at BRAHMS, STAR, SPS, NA 49 and WA 97 Collaborations. However the transverse
flow velocity and kinetic freeze-out volume are mass-dependent, and both of them decrease for
the massive particles. Furthermore, the kinetic freeze-out temperature, transverse flow velocity
and kinetic freeze-out volume in central nucleus–nucleus collisions are larger than those in
peripheral collisions. Besides, the larger kinetic freeze-out temperature and kinetic freeze-out
volume are observed in the heaviest nuclei collisions, indicating their dependence on the size
of interacting system.

About the journal
JournalChinese Journal of Physics
PublisherElsevier
Open AccessNo