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The STAR detector at RHIC, due to its large uniform acceptance and excellentparticle identification capabilities, has measured a variety of hadron species($\pi^{\pm}$, $K^{\pm}$, $p$, $\bar{p}$, $K^{0}_{S}$, $\Lambda$,$\bar{\Lambda}$, $\Xi^{-}$, $\bar{\Xi}^{+}$) produced in Au+Au collisions at$\sqrt {s_{NN}}= 7.7$, 11.5, 27 and 39 GeV. These data are part of the BeamEnergy Scan (BES) program at RHIC and provide an opportunity to measure theyields and transverse momentum spectra ($p_{T}$) of the particles produced inthe collisions. The corresponding measurements allow to study the freeze-outproperties and dynamics of heavy ion collisions. A statistical thermal modelanalysis of particle production in BES energies in both grand canonical andstrangeness canonical ensembles, is used to extract the chemical freeze-outparameters. The $p_{T}$ spectra, particle ratios, and the energy and centralitydependence of freeze-out parameters determined from the thermal fit of particleratios are discussed.

Study of freeze-out dynamics in STAR at RHIC Beam Energy Scan Program