A neutron-generator-based source of fission products (nuCARIBU) is being developed to replace the existing ²⁵²Cf source at Argonne National Laboratory. Neutrons generated by ⁷Li(p,n)⁷Be reaction are thermalized in a compact polyethylene [(C₂H₄)ₙ] moderator and impinge on a thin ²³⁵U foil to produce fission products. Experiments have been conducted to verify the nuCARIBU concept and simulation results using a 4 MeV, 0.160.28em0exA proton beam from the ATLAS accelerator irradiating a LiF neutron production target and two different simplified versions of the nuCARIBU (C₂H₄)ₙ moderator with thicknesses of 3.81 cm and 1.91 cm separating it from the enriched ²³⁵U fission foil. The emitted γ-ray peaks of 1383.93 keV (⁹²Sr), 358.0 keV (¹⁰⁴Tc), 565.992 keV (¹³⁴Te), and 258.411 keV (¹³⁸Xe) obtained from fission products are used to determine the neutron-induced fission rates in the fission foil. The measured fission rates are in good agreement with those simulated using the PHITS Monte Carlo code with user-defined neutron production cross sections based on well-known cross section data. These experimental results, consistent with the simulations, show that the current ²⁵²Cf source (CARIBU) can be replaced by the neutron induced fission source (nuCARIBU).
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Song et al. (2024) studied this question.
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