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Longitudinal asymmetry and polarisation in n( γ,π -)p on deuteron targets

An interesting effect of Fermi motion in n( gamma , pi -)p experiments on deuteron targets is the appearance of apparently parity-violating types of observables like asymmetry in the reaction plane and helicity of the recoil nucleon; these are found to be as large as 20% at typical geometries in the intermediate-energy region. Since these observables disappear in the limit of the spectator momentum tending to zero, their measurements provide a direct method to study the Fermi momentum distributions.