SSP2012 - 5th International Symposium on Symmetries in Subatomic Physics

The NPDGamma experiment aims to measure the parity-odd correlation between the neutron spin and the direction of the emitted photon in neutron-proton capture. A parity violating asymmetry (to be measured to 10$^{-8}$) from this process can be directly related to the strength of the hadronic weak interaction between nucleons, specifically the $\Delta I=1$ contribution. The experiment has been commissioned and is presently taking production data at the Fundamental Neutron Physics beam line at the Spallation Neutron Source at ORNL. The gamma-ray asymmetries from the parity-violating capture of cold neutrons on $^{35}$Cl and $^{27}$Al were measured, to check for systematic effects, false asymmetries, and backgrounds. Preliminary results for the measurements with $^{35}$Cl and $^{27}$Al will be presented as well as first results obtained up to now with the liquid parahydrogen target.