Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (ua)

О. О. Gritzay, V. V. Коlоtyi, А. I. Каltchenkо, P. M. Vorona, M. L. Gnidak

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: The total neutron cross section for ⁵²Сr nucleus was measured at the neutron energy 24 keV. The measurements were taken using the transmission method of filtered neutrons from reactor horizontal channel and chromium metal sample (enrichment 99.3 % ⁵²Cr, thickness 1.208 · 10²³ 1/cm²). The optimized content and characteristics of filtered neutron beam with the maximum of basic energy line 24.3 ± 0.8 keV and minimum of impurity energy lines were received using our own calculation code and modern neutron data from evaluated neutron data library JENDL-3.2. The calculated shape of nuclear spectra is shown just as the experimental value of filtered neutron flux from the 8th horizontal channel calculated with the activation of ¹⁹⁷Au thin sample. The measured value of ⁵²Cr effective total neutron cross section for 24 keV quasimonoenergetic neutrons - σ _t^ef. = 2.099 ± 0.012 b was compared with known experimental values from CSISRS library and the values calculated with evaluated nuclear data libraries.

1. The NEA High Priority Nuclear Data List. NEA Nuclear Science Committee (May 1998) p. 78.

2. Пуртов О. А., Шкарупа А. М., Архипов В. Н. та ін. Методика измерения полных нейтронных сечений атомных ядер в диапазоне энергий 100 - 1000 кэВ с помощью фильтрованых пучков нейтронов атомного реактора. Препр. АН УССР. Ин-т ядерных исслед. КИЯИ-89-26 (Київ, 1989) 19 с.

3. Gritzay O. O., Libman V. A., Murzin A. V. et al. Preliminary measurements of the neutron total cross section of ²⁰⁸Pb at 24 keV and the neutron polarizability. Proc. Int. Semin. Interaction of Neutrons with Nuclei (ISINN-8, JINR-E3-2000-192) (Dubna, Russia, 2000) p. 165.

4. Stieglitz R. G., Hockenbury R. W., Block R. C. keV neutron capture and transmission measurements on ⁵⁰Cr, ⁵²Cr, ⁵³Cr, ⁵⁴Cr, ⁶⁰Ni and V. Nucl. Phys. A 163 (1971) 592. https://doi.org/10.1016/0375-9474(71)90512-4

5. Spencer R. R., Beer H., Froehner F. H. The Total Neutron Cross Sections of ⁵⁰Cr, ⁵²Cr, ⁶²Ni and ⁶⁴Ni in the Energy Region 10 - 300 keV. Reprint. Kernforschungcentrum. Institut fur Angewandte Kernphysic KFK-1517 (Karlsruhe, 1972) 24 p.

6. Carlton R. F., Harvey J. A., Larson D. C. and Hill N. W. Neutron resonance spectroscopy for n + ⁵²Cr: Total and differential elastic scattering cross sections. Phys. Rev. C 62 (2000) 014608. https://doi.org/10.1103/PhysRevC.62.014608