Parity Violation of Polarized Neutron Capture in $^{27}Al$

The NPDGamma experiment measures the parity-odd asymmetry of outgoing gammas from polarized neutron capture on liquid para-hydrogen. Neutron capture on the aluminum vessel used to safely contain the liquid para-hydrogen contributes about $20\%$ of the total signal in the gamma detectors. A separate experiment was performed to determine the parity-violating gamma asymmetry in $^{27}Al$. I will present the analysis method and preliminary results.