The production of the x\ a°d Xi states of charmonium has been observed in 300 GeV/c K ± N and pN interactions. The fraction of the total inclusive J/y/ production due to radiative % decay has been determined to be 0.40 ± 0.04, 0.37 ± 0.03, and 0.30 ± 0.04 for the TT + , n~", and proton data, respectively. Total cross sections for %\ and xi production of 131 ± 18 ± 14 and 188 ± 30 ± 21 nb/nucleon in the 300 GeV/c n~N interactions have been obtained. By measuring the contributions to the J/y/ production due to both y/' and radiative % decay, the cross sections for direct J/y/ production have been determined to be 97 ± 14, 102 ± 14, and 89 ± 12 nb/nucleon for /r + , /r~, and protons, respectively.

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