Source: https://nuclear-power-engineering.ru/en/article/2017/02/13/
Timestamp: 2019-04-22 00:39:12+00:00

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The experimental verification of neutron inelastic scattering cross section on iron have been performed on the basis of neutron inelastic spectra measurements at neutron incident energies of 6.0, 7.0 and 8.0 MeV and their calculations in the framework of nuclear reactions statistical theory and direct interaction. Cross sections of neutron reactions present great interest in the context of nuclear technology. Iron is a structural material for different nuclear energy plant and has been proposed as gamma-ray cross-section standard. In spite of a big efforts agreement between the various measurements is poor and various data evaluations reflect this situation. The measurements of the inelastic scattering neutron spectra were performed by the time-of-flight fast-neutron spectrometer on the base of the EGP-10M pulsed tandem accelerator of the Institute for Physics and Power Engineering (IPPE, Obninsk). An analysis of measured data have been performed with use of the Hauser-Feshbach mathematical formalism of the statistical model for equilibrium emission, preequilibrium model and direct mechanism of nuclear reactions. The results of present work agree in the limits of the measurement errors with data of work on the measurement of gamma-ray production cross-sections performed in Los Alamos  and with new data obtained at the photo-neutron source nELBE . The obtained results show on need of correct of library of recommended evaluated neutron data BROND-2.2 for inelastic scattering cross section on iron in the direction of their increase and possible small correct of library of recommended evaluated neutron data BROND-3.
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