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The analysis of element and isotope composition by neutron spectroscopy method

The analysis of element and isotope composition by neutron spectroscopy method. N.V. Bazhazhina , Yu. D. Mareev , L.B. Pikelner , P.V. Sedyshev , V.N. Shvetsov. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research. Excited states of compound nucleus.

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The analysis of element and isotope composition by neutron spectroscopy method

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  1. The analysis of element and isotope composition by neutron spectroscopy method N.V. Bazhazhina, Yu. D. Mareev, L.B. Pikelner, P.V. Sedyshev, V.N. Shvetsov Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research

  2. Excited states of compound nucleus

  3. Neutron transmission measurement

  4. Partial cross sections measurements

  5. IREN parameters

  6. General view of the detector

  7. Request of Central Geological Laboratory of Mongolia

  8. Time-of-flight spectrum for sample from Mongolia 250 ns

  9. Amount of the element is determined by an intensity of the resonance area - number of neutrons which crossed all area of the sample during measurement - detection efficiency - radiation width of the resonance - total width of the resonance - resonance area on the transmission curve, where is defined as function of the resonance parameters and the sample thickness (nuclei/cm2).

  10. Used curves for the analysis of neutron resonances

  11. Results of analysis

  12. Boron enriched unfired phosphate ceramics

  13. Determination of B content in composite material - the number of target nuclei per 1 cm2 , which do not have resonances and they have only the constant elastic cross section. - the number of target nuclei per 1 cm2 , which have the energy dependence of the cross section.

  14. Determination of B content in composite material

  15. Determination of B content in composite material

  16. Thanks for your attention

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