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The NPDGamma collaboration is performing a measurement of the very small parity-violating asymmetry in the angular distribution of the 2.2MeV γ-rays from the capture of polarized cold neutrons on protons (Aγ). The estimated size of Aγ is 5×10−8, and the measured asymmetry is proportional to the neutron polarization upon capture. Since the interaction of polarized neutrons with one of the two hydrogen...
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