  We describe an experiment that has set new limits on the time reversal
invariance violating D coefficient in neutron beta-decay. The emiT experiment
measured the angular correlation J . p_e x p_p using an octagonal symmetry that
optimizes electron-proton coincidence rates. The result is
D=[-0.6+/-1.2(stat)+/-0.5(syst)]x10^(-3). This improves constraints on the
phase of g_A/g_V and limits contributions to T violation due to leptoquarks.
This paper presents details of the experiment, data analysis, and the
investigation of systematic effects.
