A general parity non-conserving absorption process of partly. polarized (Μ−-mesons by protons in a nucleus is considered. The Fermi gas model is used to estimate the effect of the motion of the protons inside the nucleus on the anisotropy of the emitted neutrons. It is found that the anisotropy of the neutron distribution in the fundamental interaction is mostly preserved, especially towards the upper end of the neutron spectrum: thus an experiment to observe the neutron asymmetry seems, feasible.