Vector Analyzing Power Measurements During PREX-II

I report on measurements of the vector analyzing power $A_{n}$ on various spin-0 nuclei during PREX-II at $< Q^{2} >$ = 0.0064 $(\frac{GeV}{c})^{2}$ and $<\theta>$ = $5^{\circ}$. The PREX-II experiment at Jefferson Lab measures the parity-violating (PV) asymmetry of longitudinally polarized electrons elastically scattering off an unpolarized ${^{208}}{Pb}$ target. The analyzing power couples to any residual transverse beam polarization thus making it a potential source of systematic error. Dedicated $A_{n}$ measurements took place during PREX-II highlighted by the first $A_{n}$ measurement on an intermediate Z nuclei, ${^{40}}{Ca}$. The ${^{40}}{Ca}$ measurement is interesting, providing additional input in better understanding the Z dependence of the analyzing power. In addition, $A_{n}$ measurements were taken on ${^{208}}{Pb}$ and ${^{12}}{C}$. The ${^{12}}{C} A_{n}$ is required due to the lead target being sandwiched between two diamond foils.