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The equation for the angular distribution of the products from decay of a polarized neutron into an antineutrino, an electron, and a proton was studied by determining coefficients B and D with coincidence asymmetry measurements (B is the coefficient of the correlation between the neutron spin and anti-neutrino direction, and D that of the correlation between the neutron spin and the electron-antineutrino interaction). B was determined to be +0.96 plus or minus 0.40, which is compared with the theoretical plot of B as a function of the vector and axial vector interaction ratio. D was determined to be --0.14 plus or minus 0.20, which is consistent with the assumption of time reversal invariance for the neutron decay. (D.L. C.)
Clark et al. (Sun,) studied this question.