Production ofHΛ3andHΛ4in central11.5GeV∕cAu+Ptheavy ion collisions

We present measurements from BNL AGS Experiment 864 of the ${}_{\Lambda }{}^3\mathrm{H}$ yield and of an upper limit on the ${}_{\Lambda }{}^4\mathrm{H}$ yield in central $11.5A\text{GeV}∕c\text{Au}+\text{Pt}$ collisions. The measurements span a rapidity range from center of mass, $y_{\mathrm{c.m.}}$, to $y_{\mathrm{c.m.}}+1$ and a transverse momentum range of $0<p_t⩽1.5\text{GeV}∕c$. We compare these results with E864 measurements of stable light nuclei and particle unstable nuclei yields of the same baryon number. The implications of these results for the coalescence of strange clusters are discussed.