  The Baksan Experiment on Sterile Transitions (BEST) was designed to
investigate the deficit of electron neutrinos, $\nu_{e}$, observed in previous
gallium-based radiochemical measurements with high-intensity neutrino sources,
commonly referred to as the \textit{gallium anomaly}, which could be
interpreted as evidence for oscillations between $\nu_e$ and sterile neutrino
($\nu_s$) states. A 3.414-MCi \nuc{51}{Cr} $\nu_e$ source was placed at the
center of two nested Ga volumes and measurements were made of the production of
\nuc{71}{Ge} through the charged current reaction,
\nuc{71}{Ga}($\nu_e$,e$^-$)\nuc{71}{Ge}, at two average distances. The measured
production rates for the inner and the outer targets respectively are
($54.9^{+2.5}_{-2.4}(\mbox{stat})\pm1.4 (\mbox{syst})$) and
($55.6^{+2.7}_{-2.6}(\mbox{stat})\pm1.4 (\mbox{syst})$) atoms of
\nuc{71}{Ge}/d. The ratio ($R$) of the measured rate of \nuc{71}{Ge} production
at each distance to the expected rate from the known cross section and
experimental efficiencies are $R_{in}=0.79\pm0.05$ and $R_{out}= 0.77\pm0.05$.
The ratio of the outer to the inner result is 0.97$\pm$0.07, which is
consistent with unity within uncertainty. The rates at each distance were found
to be similar, but 20-24\% lower than expected, thus reaffirming the anomaly.
These results are consistent with $\nu_e \rightarrow \nu_s$ oscillations with a
relatively large $\Delta m^2$ ($>$0.5 eV$^2$) and mixing sin$^2 2\theta$
($\approx$0.4).
