New Experimental Limit onTInvariance in Polarized-NeutronβDecay

We report an improved experimental upper limit for $D$, the triple-correlation coefficient in polarized-neutron decay. A nonzero value for this coefficient implies a breakdown of $T$ invariance. We find that $D=-(1.1\mathrm{}\pm 1.7)\times {10}^{-3\mathrm{}}$, consistent with $T$ invariance.