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Within the framework of a multiphase transport model, we study the productionand properties of $\Omega$ and $\phi$ in Au + Au collisions with a new set ofparameters for $\sqrt{s_{NN}}$ = 200 GeV and with the original set ofparameters for $\sqrt{s_{NN}}$ = 11.5 GeV, respectively. The AMPT model withthe string melting version provides a reasonable description at $\sqrt{s_{NN}}$= 200 GeV and while the AMPT model with default version describes the data wellat $\sqrt{s_{NN}}$ = 11.5 GeV. It indicates that the system created at top RHICenergy is dominated by partonic interaction and while the hadronic interactionbecomes important at lower beam energy, such as $\sqrt{s_{NN}}$ = 11.5 GeV. Thecomparison of $N(\Omega ^++\Omega^-)/[2N(\phi)]$ ratio between data andcalculations further supports the argument. Our calculations can generallydescribe the data of nuclear modification factor as well as elliptic flow.

$\Omega$ and $\phi$ in Au + Au ~collisions at \srt~= 200 and 11.5 GeV from a multiphase transport model