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Information × Registration Number 0221U103268, 0115U001657 , R & D reports Title Investigation of neutron interaction with atomic nuclei at the reactor filtered beams and development of nuclear-constant base for fundamental and applied problems popup.stage_title Head Grytsay Olena O, Кандидат фізико-математичних наук Registration Date 17-02-2021 Organization Institute of Nuclear Research of the National Academy of Sciences of Ukraine popup.description2 Measurements of the total neutron cross section of natural hafnium at the energy of filtered neutron 59 keV were performed. The filter was supplemented with new components in order to increase the intensity of the main line and reduce the contribution of impurity lines. The filter was calculated using the FILTER_7 program based on JEFF-3.2 libraries. The composition of the composite filter with an average energy of 59 keV: S (116.53 g/cm2), 58Ni (81.42 g/cm2), V (24.44 g/cm2), Al (5.4 g/cm2), 10B (0.517 g/cm2), Calculated purity of the filter - 95.0%, average energy (at the level of 95% of the response function) 58.5 (+1.9, -6.4) keV. Measurements were performed experimentally on two samples with a thickness of 0.00199 and 0.00242 atoms/barn, as well as measurements when there were 2 samples on the beam at the same time. Extrapolation of the cross section to zero thickness by a linear function gives the value of the unshielded cross section 8.92 +- 0.18 barn. However, we can consider the obtained cross-sectional value of natHf only as a preliminary result. The analysis of the possibility of studying the neutron capture cross sections for uranium and hafnium nuclei with high accuracy is performed. It is proved that the activation method provides an opportunity to obtain greater reliability of the result and better statistical accuracy. It is proved that it is practically impossible to obtain the values of the average neutron capture cross sections for 238U nuclei in our conditions. An algorithm has been developed and software products for spectral data preparation have been created. Thanks to the developed software products, numerical data of experimental and calculated spectra of neutrons after interference neutron filters used in measurements on KRR (9 data blocks with spectra) were prepared and entered into the international database of experimental data CSISRS / EXFOR. Product Description popup.authors Pishchal Elina Yo. popup.nrat_date 2021-02-17 Close