  The RHIC Beam Energy Scan focuses on the study of the QCD phase diagram ---
temperature ($T$) vs. baryon chemical potential ($\mu_B$). The aim is to verify
some predictions from QCD: that a cross-over occurs at $\mu_B$ = 0, that there
exists a first-order phase transition at large $\mu_B$ and a critical point at
an intermediate $\mu_B$. The spectra and ratios of produced particles can be
used to extract $T$ and $\mu_B$ in different energies and system sizes. The
STAR experiment has collected data for Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7
GeV, 11.5 GeV, and 39 GeV in the year 2010. We present midrapidity $p_{T}$
spectra, rapidity density, average transverse mass, and particle ratios for
identified hadrons from the STAR experiment. The centrality and transverse
momentum dependence of the particle yields and ratios are compared to existing
data at lower and higher beam energies. The chemical and kinetic freeze-out
conditions are extracted from the ratios and particle spectra.
