Centrality-Driven Modifications of Kinetic Freeze-out Spectra at {{s₍₍}} = 62. 4 GeV

We present a systematic study of rapidity distributions and transverse momentum spectra of identified hadrons produced in Au+Au collisions at center of mass energy {{s₍₍}} = 62. 4 GeV at relativistic heavy ion collider (RHIC). The available rapidity distributions of protons (p), anti-protons (p), p/p, kaons ({K^ + }), anti-kaons ({ {K}^ - }), and K/K are analyzed for the most central collisions, while the transverse momentum spectra of non-strange and strange hadrons (p, p, {K^ + }, { {K}^ - }, Lambda (), anti-Lambda (), Cascade (), anti-Cascade (), and Omega ({ ^ }) ) are studied over the full range of available centrality classes. The experimental rapidity and transverse momentum distributions are well reproduced within a unified statistical thermal freeze-out model incorporating simultaneous longitudinal and transverse collective expansion. The transverse size of the expanding hadronic fireball is assumed to follow a Gaussian profile along the longitudinal direction. Thermo-chemical freeze-out parameters, including the temperature, baryon chemical potential, and collective flow velocity, are extracted. The results indicate an earlier freeze-out of multi-strange hyperons compared to singly strange and non-strange hadrons throughout the system evolution. A clear centrality dependence of the freeze-out parameters is observed, with increasing kinetic freeze-out temperature and decreasing collective flow toward more peripheral collisions. Contributions from heavier hadronic resonance decays are also included in the analysis.