Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of the ^<129>I(n, γ)^<130>I Reaction

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著者

    • NAKAMURA Shoji
    • Nuclear Fuel Technology Development Division, Power Reactor and Nuclear Fuel Development Corp.
    • HARADA Hideo
    • Nuclear Fuel Technology Development Division, Power Reactor and Nuclear Fuel Development Corp.

抄録

To obtain fundamental data for research on the transmutation of nuclear wastes, the thermal neutron cross section and the resonance integral of the <SUP>129</SUP>I(n, γ)<SUP>130</SUP>I reaction have been measured using an activation method. The neutron cross sections for the formation of the ground (5<SUP>+</SUP>) state and the isomeric (2<SUP>+</SUP>) state of 130I were measured separately.<BR>Six <SUP>129</SUP>I targets were irradiated for 10min with thermal reactor neutrons; three of them containing 2.55-2.61 kBq of <SUP>129</SUP>I were irradiated within a Cd capsule, and the other three targets containing 259-261Bq of <SUP>129</SUP>I were irradiated without it. The Co/Al and Au/Al alloy wires were used to monitor the neutron flux and the fraction of the epithermal part (Westcott's epithermal index). The gamma-ray spectra from the irradiated samples were measured with a Ge detector.<BR>The thermal neutron capture cross section (the 2, 200m/s neutron cross section) and the resonance integral of the <SUP>129</SUP>I(n, γ)<SUP>130</SUP>I reaction were determined to be 12.5±0.5b and 15.6±0.7b for the formation of the groundstate <SUP>130g</SUP>I(5+), 17.8±0.7b and 18.2±0.8b for the formation of the isomeric state <SUP>130m</SUP>I(2+), and 30.3±1.2b and 33.8±1.4b for the formation of <SUP>130</SUP>I (the sum of the 2<SUP>+</SUP> and the 5<SUP>+</SUP> states), respectively. The sum of the thermal neutron capture cross sections forming the 2<SUP>+</SUP> and the 5<SUP>+</SUP> states was 12% larger than the evaluated values of JENDL-3.2 and ENDF/B-VI and that reported by Roy et al. This discrepancy is explained by the population of the isomeric level.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 33(4), p.283-289, 1996-04-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002074536
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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