Total Cross Sections for 14-Mev Neutrons

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Abstract

With deuterons from the electrostatic generator of the Department of Terrestrial Magnetism incident on a tritium-zirconium target, and with the neutrons detected by a terphenylxylene scintillator and photomultiplier, total cross sections of C, H, D, O, and N for 14.10\ifmmode\pm\else\textpm\fi{}0.05 Mev neutrons were measured. The effective neutron energy was evaluated from the kinematics of the $\mathrm{T}(d,n){\mathrm{He}}^{4}$ reaction, the dependence of the reaction's cross section on energy and angle, and the multiple scattering of the deuterons and their rate of energy loss in the target. A least squares analysis of the transmissions of six thicknesses each of carbon and polyethylene (40 to 85 percent transmissions) yielded, for total cross sections $\ensuremath{\sigma}$ in barns: ${\ensuremath{\sigma}}_{\mathrm{C}}=1.279\ifmmode\pm\else\textpm\fi{}0.004$ and ${\ensuremath{\sigma}}_{\mathrm{H}}=0.689\ifmmode\pm\else\textpm\fi{}0.005$. Transmissions of light and heavy water gave ${\ensuremath{\sigma}}_{\mathrm{D}}=0.803\ifmmode\pm\else\textpm\fi{}0.014$ and ${\ensuremath{\sigma}}_{\mathrm{O}}=1.64\ifmmode\pm\else\textpm\fi{}0.04$. Transmission of melamine gave ${\ensuremath{\sigma}}_{\mathrm{N}}=1.7\ifmmode\pm\else\textpm\fi{}0.1$.

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