  We present the search results for muonic atoms on $\sqrt{s_{NN}}=200$ GeV
Au+Au collisions collected by the STAR experiment at RHIC. With the muon
identification at low momentum, the invariant mass spectra were reconstructed.
Clear signals are observed at the expected atom masses. Two particle
correlations show that the production of the daughter particles happens at the
same space-time point, presenting the signature of atom ionization. The
fraction of primordial muons is extracted from $\pi$-$\mu$ correlations.
