<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts/><mml:none/><mml:mn>12</mml:mn></mml:mmultiscripts></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML

Improved neutron inelastic scattering cross sections have repeatedly been identified as a top priority nuclear data need, important for basic science and a range of applications in nuclear energy, stockpile stewardship, and proliferation detection. For the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi mathvariant="normal">C</a:mi><a:mprescripts/><a:none/><a:mn>12</a:mn></a:mmultiscripts></a:math>(<c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mi>n</c:mi><c:mo>,</c:mo><c:msup><c:mi>n</c:mi><c:mo>′</c:mo></c:msup><c:mi>γ</c:mi></c:mrow></c:math>) reaction in particular, recent measurements have unveiled some structural discrepancies, demonstrating incongruities among themselves and in relation to the ENDF/B-VIII.0 nuclear data evaluation. To help resolve these disagreements, a measurement was performed at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory using a broad-spectrum neutron beam and a 99.8% pure natural carbon target. The Gamma Energy Neutron Energy Spectrometer for Inelastic Scattering (GENESIS) was employed to measure energy-differential <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mi>γ</d:mi></d:math>-ray emission spectra as a function of incident neutron energy in the energy range of 5.5 to 16.7 MeV. The <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mmultiscripts><e:mi mathvariant="normal">C</e:mi><e:mprescripts/><e:none/><e:mn>12</e:mn></e:mmultiscripts></e:math> partial <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"><g:mi>γ</g:mi></g:math>-ray cross sections were extracted at <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"><h:msup><h:mn>63</h:mn><h:mo>∘</h:mo></h:msup><h:mo>,</h:mo><h:mo> </h:mo><h:mrow><h:mn>122</h:mn><h:mo>.</h:mo><h:msup><h:mn>5</h:mn><h:mo>∘</h:mo></h:msup></h:mrow></h:math>, and <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:msup><i:mn>150</i:mn><i:mo>∘</i:mo></i:msup></i:math> with respect to the incoming neutron beam and integrated using angular distribution data available in the literature. The data show agreement with a recent literature measurement and evaluation from 11 to 15 MeV, but indicate a larger cross section for incident neutron energies between 5.5 and 8.5 MeV. The measured relative angular distributions are also reported and were found to agree with evaluation.