Vector Analyzing Power Measurements During CREX

In elastic electron nucleus scattering where the electron's polarization is perpendicular to its momentum, a vector analyzing power is proportional to the imaginary component of the two photon exchange process. The analyzing power was measured for $^{40}$Ca, $^{48}$Ca, $^{208}$Pb, and $^{12}$C using a 2.2 GeV electron probe. Calcium provides a useful insight into intermediate nuclei to fill the gap in experimental data between Aluminum and Lead. The measurement of two isotopes of calcium gives information about any Z independent effects that may exist. Preliminary results will be shown.