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The use of tantalum foil in the study of production and transport of neutrons in assemblies with lead target irradiated by high energy deuterons Autor: Ondřej Novák Konzultant: RNDr. Vladimír Wagner, CSc

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Introduction Problem of nuclear energy – long half – life of nuclear waste Solution= Transmutation – Changing stability of radioisotope by interaction of neutron – Shorter half - life

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Main goal: To measure the quantity, spatial distribution and energy of neutrons in the transmutation system by tantalum foil

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Threshold energy Energy, which is the lowiest for special (n,xn) reaction Reaction (n,γ) 182 Ta(n,2n) 180 Ta(n,4n) 178m Ta(n,5n) 177 Ta(n,6n) 176 Ta(n,7n) 175 Ta(n,9n) 173 Ta Treshold energy 0 MeV7,6 MeV22,7 MeV29,2 MeV37,5 MeV44,5 MeV60,7 MeV Half - life 114.5 d8,152 h2,36 h56,56 h8,09 h10,5 h3,14 h

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Spectra analysis Fit of peaks by special (Gauss) function – Integral area

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Data analysis The measured amount of gamma-rays of special line was calculated to obtain the total number of radioisotope with specific line. The total number of nuclei of specific isotope was calculated from these values by using the formula for the weighted average

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Reaction 181 Ta (n,gama) 182 Ta

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Reaction 181 Ta (n,2n) 180 Ta

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Reaction 181 Ta (n,3n) 179 Ta Half - life is too long or too short 179m Ta 9 ms => stable 179 Hf 179 Ta 1,87 year

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Raction 181 Ta (n,4n) 178 Ta

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experiment - simulation The total number of neutrons(indirect) – Simulation describe whole system – Experiment only few places

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Experiment – simulation - Au

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End I process only one part of experiment I obtained amount of radioisotopes produced by neutron reactions Description of neutron spatial distribution Obtained results will help to test models which are used for description of nuclear

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