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We study the production of pions, kaons, and (anti)protons in A Multi PhaseTransport (AMPT) Model in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7, 27, and 200GeV. We present the centrality and energy dependence of various bulkobservables such as invariant yields as a function of transverse momentum$p_T$, particle yields $dN/dy$, average transverse momentum $\langle p_T\rangle$, and various particle ratios, and compare them with experimental data.Both default and string melting (SM) versions of the AMPT model are used withthree different sets of initial conditions. We observe that neither the defaultnor the SM version of the model could consistently describe the centralitydependence of all observables at the above energies with any one set of initialconditions. The energy dependence behavior of the experimental observables for0--5\% central collisions is in general better described by the default AMPTmodel using the modified HIJING parameters for Lund string fragmentation and3mb parton scattering cross-section. In addition, the kaon production as wellas the $K/\pi$ ratio at 7.7 GeV are under predicted by the AMPT model.

Constraining the Particle Production Mechanism in Au+Au Collisions at $\sqrt{s_{NN}}=$ 7.7, 27, and 200 GeV Using A Multi Phase Transport Model