  We report the results of an improved experiment aimed at determining whether
the half-life ($T_{1/2}$) of $^{198}$Au depends on the shape of the source. In
this experiment, the half-lives of a gold sphere and a thin gold wire were
measured after each had been irradiated in the NIST Center for Neutron
Research. In comparison to an earlier version of this experiment, both the
specific activities of the samples and their relative surface/volume ratios
have been increased, leading to an improved test for the hypothesized
self-induced decay (SID) effect. We find T_1/2(sphere)/T_1/2(wire) =
0.9993+/-0.0002, which is compatible with no SID effect.
