A liquid parahydrogen target for the NPDGamma Experiment*

The NPDGamma Experiment, which is running at the SNS, is in the process of measuring the parity-violating correlation $A_\gamma$ between neutron spin and gamma momentum in the reaction $\overrightarrow{n} + p\rightarrow d + \gamma$ with a projected statistics-limited precision of $10^{-8}$. To achieve this statistical goal, a polarized cold neutron beam is captured in a 16 liter liquid parahydrogen target which includes a cryogenic system, containment mechanisms designed for safe filling, venting and storage of the hydrogen, and a data acquisition system. We will describe the target system and its performance.