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The $^{12}$C(n, 2n)$^{11}$C cross section was measured from just belowthreshold to 26.5 MeV using the Pelletron accelerator at Ohio University.Monoenergetic neutrons, produced via the $^3$H(d,n)$^4$He reaction, wereallowed to strike targets of polyethylene and graphite. Activation of bothtargets was measured by counting positron annihilations resulting from the$\beta^+$ decay of $^{11}$C. Annihilation gamma rays were detected, both incoincidence and singly, using back-to-back NaI detectors. The incident neutronflux was determined indirectly via $^{1}$H(n,p) protons elastically scatteredfrom the polyethylene target. Previous measurements fall into upper and lowerbands, the results of the present measurement are consistent with the upperband.

The $^{12}$C(n, 2n)$^{11}$C cross section from threshold to 26.5 MeV