Gamma-Rays of some Principal Fuel Nuclei Excited by Monochromatic Neutrons
Gamma-ray spectra in the interactions of 232Th, 236U, and 238U with neutrons of energies 0.7–2.0 MeV, 3.0 MeV, and 14.9 MeV have been measured. Above 300 gamma-transitions have been revealed. The neutron flux was determined using small fission chambers, activation foils, and scintillation counters. Gamma-ray excitation cross sections of the 232Th(n, nδ)-, and 238U(n, nδ)reactions obtained at neutron energies of 0.7–2.0 MeV and 3.0 MeV were transformed to the partial neutron scattering cross sections. The data indicate an appreciable level population by unobserved gamma-transitions from unknown high lying levels. Fission fragment gamma-ray intensities were determined at neutron energies of 3.0 MeV and 14.9 MeV in a time gate of 25 ns. The coincidence within experimental errors was found between 2+ – 0+ transition yields and independent yields of corresponding even-even fission fragments.
KeywordsGamma-ray spectra 232Th 235U 238U fission inelastic scattering cross section excitation function level population independent fission fragment yield
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