The 12C(n, 2n)11C cross section was measured from just below threshold to 26.5 MeV using the Pelletron accelerator at Ohio University. Monoenergetic neutrons, produced via the 3H(d,n)4He reaction, were allowed to strike targets of polyethylene and graphite. Activation of both targets was measured by counting positron annihilations resulting from the β+ decay of 11C. Annihilation gamma rays were detected, both in coincidence and singly, using back-to-back NaI detectors. The incident neutron flux was determined indirectly via 1H(n,p) protons elastically scattered from the polyethylene target. Previous measurements fall into upper and lower bands, the results of the present measurement are consistent with the upper band.
@article{arxiv.1707.09375,
title = {The $^{12}$C(n, 2n)$^{11}$C cross section from threshold to 26.5 MeV},
author = {M. Yuly and T. Eckert and G. Hartshaw and S. J. Padalino and D. N. Polsin and M. Russ and A. T. Simone and C. R. Brune and T. N. Massey and C. E. Parker and R. Fitzgerald and T. C. Sangster and S. P. Regan},
journal= {arXiv preprint arXiv:1707.09375},
year = {2018}
}