Production ofK+Mesons in 2.1-GeV/Nucleon Nuclear Collisions

$K^{+}$ meson production by 2.1-GeV/nucleon Ne, $d$, and $p$ projectiles on NaF and Pb targets has been measured. The cross sections depend exponentially upon the kaon energy in the nucleon-nucleon c.m. frame, with an inverse slope $T_0$ larger than the values obtained from comparable proton and ${\pi }^{-}$ spectra. The angular distribution in this frame is approximately isotropic. We find that $\frac{\sigma (\mathrm{Ne}+\mathrm{Pb}\to K^{+}X)}{\sigma (\mathrm{Ne}+\mathrm{NaF}\to K^{+}X)}>\frac{\sigma (d+\mathrm{Pb}\to K^{+}X)}{\sigma (d+\mathrm{NaF}\to K^{+}X)}$. Data are compared with theoretical predictions.