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| Book/Report | FZJ-2018-02858 |
1988
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/18475
Report No.: Juel-2196
Abstract: Cross Sections were measured with uncertainties of 13 to 21 % for the reactions $^{9}$Be(n, t)$^{7}$Li, $^{10}$B(n, t)2$\alpha$ and $^{14}$N(n, t)$^{12}$C over various energy ranges. Irradiations were performed with thermal neutrons and neutrons produced via the reactions $^{2}$H(d, n)$^{3}$He and $^{9}$Be(d, n)$4^{10}$B. The tritium produced and accumulated in the irradiated samples was separated by vacuum extraction and measured in the gas phase using anticoincidence $\beta^{-}$ counting. The residual tritium content was determined for the enriched $^{10}$B and AIN samples. The characteristics of tritium diffusion in B$_{4}$C were studied by high-temperature release experiments. The Li impurity in the AlN sample was determined via neutron activation analysis. The average $^{9}$Be(n, t)$^{7}$Li cross sections lie between 3 and 14 mb for break-up neutrons produced by 17.5 to 31.0 MeV deuterons on a thick Be target. A comparison of the measured date with the values deduced from differential date and neutron spectral distributions shows agreement within $\pm$ 21 %. The $^{10}$B(n, t)2$\alpha$ cross sections in the neutron energy range of 0.025 eV to 10.6 MeV lie between 12 and 215 mb (with the maximum at about 5.5 MeV). The $^{14}$N(n, t)$^{12}$C cross sections in the neutron energy range of 5.0 to 10.6 MeV lie between 11 and 30 mb. The excitatian function shows a fluctuation which is attributed to the decay properties of the compound nucleus $^{15}$N. Detailed Hauser-Feshbach calculations show that the statistical model cannot satisfactorily describe the (n, t) cross section on light nuclei.
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