Background: Single-crystal chemical vapor deposited (sCVD) diamond detectors offer a unique method to study cross sections of reactions on carbon since they can be used as active targets. Previous studies analyzing neutrons on carbon using these detectors were primarily focused on lower-energy neutrons and reactions, and some of these did not have sufficient energy resolution to isolate the contributions of reaction channels with similar Q values.

Purpose: This work extends neutron-induced reaction cross section measurements to higher energies, relevant to rare isotope facilities. These measurements can be used to inform and benchmark simulation of experiments that require neutron detection, particularly those utilizing organic scintillators. For some experiments, simulations are used to extract physics information from experimental data, reinforcing the need for accurate simulations.

Methods: Two sCVD diamond detectors were used as active targets at the Los Alamos Neutron Science Center (LANSCE), where neutrons up to 800 MeV are produced via spallation.

Results: Relative cross sections are reported from incident neutron (kinetic) energies $E_n=12$ MeV up to 55 MeV for ${}^{12}\mathrm{C}(n,{\alpha }_0)$, up to 46 MeV for ${}^{12}\mathrm{C}(n,d_0)$, and up to 27 MeV for ${}^{12}\mathrm{C}(n,p_0)$ and ${}^{12}\mathrm{C}(n,p_1)$. These measurements extend these cross sections to energies higher than those of previous studies.

Conclusions: Good agreement is found between this work and recent experimental data from the EXFOR database in the neutron energies where the studies overlap. This work supports the need to update the ENDF evaluation for the ($n,{\alpha }_0)$ channel with more recent data and provides data that could allow for an evaluation of the ($n,p_0$), ($n,p_1$), and ($n,d_0$) channels. These cross sections will increase the accuracy of simulations by extending the energy range for which empirical cross sections are available and including new reaction channels.

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