sNN=200 GeV and with the original set of parameters for √sNN=11.5 GeV. The AMPT model with string melting provides a reasonable description at √sNN=200 GeV, while the default AMPT model describes the data well at √sNN=11.5 GeV. This indicates that the system created at top RHIC energy is dominated by partonic interactions, while hadronic interactions become important at lower beam energy, such as √sNN=11.5 GeV. The comparison of N(Ω++Ω-)/[2N(φ)] ratio between data and calculations further supports the argument. Our calculations can generally describe the data of nuclear modification factor as well as elliptic flow."> Ω and <em>φ</em> in Au+Au collisions at sqrt(<em>S</em><sub>NN</sub>)=200 and 11.5 GeV from a multiphase transport model -
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