Abstract
The polarization of quasifree \ensuremath{\Lambda} hyperons produced by the (${\mathrm{\ensuremath{\pi}}}^{+}$${\mathit{K}}^{+}$) reaction on $^{12}\mathrm{C}$ and on the deuteron was measured for the first time. The asymmetry of pions from weak decay of the \ensuremath{\Lambda} hyperon was used to determine the polarization. The polarization for the deuterium target was found to be consistent with that for the elementary n(${\mathrm{\ensuremath{\pi}}}^{+}$,${\mathit{K}}^{+}$)\ensuremath{\Lambda} reaction. The polarization of the \ensuremath{\Lambda} produced by the quasifree process from $^{12}\mathrm{C}$ is consistent with that for the elementary reaction, which demonstrates that the spin characteristics of the elementary reaction are not modified by the nuclear medium.
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