Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of the 129(n,.GAMMA.)130I Reaction.

• 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.

• KATOH Toshio

  Department of Nuclear Engineering, Nagoya University Power Reactor and Nuclear Fuel Development Corp.,

• OGATA Yoshimune

  Radioisotope Research Center, Nagoya University

Abstract

To obtain fundamental data for research on the transmutation of nuclear wastes, the thermal neutron cross section and the resonance integral of the ¹²⁹I(n, γ)¹³⁰I reaction have been measured using an activation method. The neutron cross sections for the formation of the ground (5⁺) state and the isomeric (2⁺) state of 130I were measured separately.<BR>Six ¹²⁹I targets were irradiated for 10min with thermal reactor neutrons; three of them containing 2.55-2.61 kBq of ¹²⁹I were irradiated within a Cd capsule, and the other three targets containing 259-261Bq of ¹²⁹I 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 ¹²⁹I(n, γ)¹³⁰I reaction were determined to be 12.5±0.5b and 15.6±0.7b for the formation of the groundstate ^130gI(5+), 17.8±0.7b and 18.2±0.8b for the formation of the isomeric state ^130mI(2+), and 30.3±1.2b and 33.8±1.4b for the formation of ¹³⁰I (the sum of the 2⁺ and the 5⁺ states), respectively. The sum of the thermal neutron capture cross sections forming the 2⁺ and the 5⁺ 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.

Journal

• Journal of Nuclear Science and Technology

  Journal of Nuclear Science and Technology 33 (4), 283-289, 1996

  Atomic Energy Society of Japan

Keywords

• nuclear transmutation
• radioactive waste
• thermal neutron capture
• iodine 129
• iodine 130
• thermal neutron
• resonance integral
• neutron cross sections
• half-life gamma-ray spectra
• activation method
• fission products
• experimental data
• isomeric transition probability

Details

• CRID: 1390001204095065344
• NII Article ID: 10002074536
• NII Book ID: AA00703720
• DOI: 10.3327/jnst.33.283
• COI: 1:CAS:528:DyaK28Xjt1Cjs7c%3D
• ISSN: 18811248
• ISSN: 00223131
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed