A single-crystal chemical-vapor-deposited diamond detector was used at the Los Alamos Neutron Science Center to measure neutron-induced reactions on carbon. Neutrons with a broad energy spectrum were produced via spallation. Relative cross sections are reported from above threshold up to 26 MeV incident neutron energy for ${}^{12}\mathrm{C}(n,p_2){}^{12}\mathrm{B}$, up to 23 MeV for ${}^{12}\mathrm{C}(n,p_{3+4}){}^{12}\mathrm{B}$, and up to 35 MeV for ${}^{12}\mathrm{C}(n,d_1){}^{11}\mathrm{B}$ and ${}^{12}\mathrm{C}(n,d_2){}^{11}\mathrm{B}$, all of which represent the highest-energy measurements for these reactions to date and the first measurement for $(n,d_2)$. Cross sections for ${}^{12}\mathrm{C}(n,p){{}^{12}\mathrm{B}}_{\text{total}}$ and ${}^{12}\mathrm{C}(n,d){{}^{11}\mathrm{B}}_{\text{total}}$ are also reported from sums of the partial cross sections. These measurements are compared with recent data from EXFOR as well as talys calculations. These data are useful for future nuclear data evaluations and can be used as cross-section inputs for data-based simulation packages.

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• Nuclear reactions
• Nucleon induced nuclear reactions
• 6 ≤ A ≤ 19
• Nuclear data analysis & compilation
• Radiation detectors