Abstract
The main goal of the NPDGamma experiment is to measure the gamma-ray asymmetry with respect to the neutron spin direction in the nuclear reaction $\overrightarrow{n}+ p \rightarrow d + \gamma$ . The up-down asymmetry A γ has a predicted size of the order of 5 ·10 − 8 , and the NPDGamma experiment is designed to measure it with an uncertainty of about 10 − 8. To test the entire apparatus the gamma-ray asymmetry from neutron capture was measured using a Cl target followed by measurements on Al to establish the relevant background levels. At present the experiment is taking data with a liquid H 2 target to measure the parity violation on the $\overrightarrow{n} + p \rightarrow d + \gamma$ reaction and extract the ΔI = 1 part of the hadronic weak interaction.
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