Measurement of Thermal Neutron Cross Section and Resonance Integral of the Reaction 137Cs(n,.GAMMA.) 138Cs.

• SEKINE Toshiaki

  Department of Radioisotopes, Japan Atomic Energy Research Institute

• HATSUKAWA Yuichi

  Department of Radioisotopes, Japan Atomic Energy Research Institute

• KOBAYASHI Katsutoshi

  Department of Radioisotopes, Japan Atomic Energy Research Institute

• HARADA Hideo

  Nuclear Fuel Technology Development Division,Power Reactor and Nuclear Fuel Development Corp.

• WATANABE Hisashi

  Nuclear Fuel Technology Development Division,Power Reactor and Nuclear Fuel Development Corp.

• KATOH Toshio

  Department of Nuclear Engineering, Nagoya University

抄録

To obtain fundamental data for the research of the transmutation of nuclear waste, the thermal neutron cross section and the resonance integral of the reaction ¹³⁷Cs(n, γ)¹³⁸Cs have been measured by means of a modified Cd-ratio technique. Targets of about 0.4 MBq ¹³⁷Cs were irradiated with neutrons in the JRR-4 swimming pool reactor by using a pneumatic tube equipped with a movable Cd shield, and neutron fluxes and their epithermal neutron fractions were monitored with activation detectors (Co/AI and Au/AI) whose sensitivity to epithermal neutrons differed from each other. After irradiation, the ¹³⁷Cs samples were purified chemically and their γ-ray spectra were measured with a high purity Ge detector. The resulting yields of ¹³⁸Cs for different neutron spectra and the neutron flux data have yielded that the thermal neutron cross section (for 2, 200 m/s neutrons) is 0.25±0.02 b and the resonance integral 0.36± 0.07 b. The results are consistent with the effective cross section (σ=0.250±0.013 b) of our previous measurement. An uncertainty due to neglecting the production of the short-lived isomer of ¹³⁸Cs was calculated on the basis of the isomeric yield ratio given by the Huizenga and Vandenbosch model. A probable uncertainty was estimated to be +1.2% or +3.9%, depending on the spin of the compound nucleus produced in the s-wave neutron capture.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　Ｎｕｃｌｅａｒ　Ｓｃｉｅｎｃｅ　ａｎｄ　Ｔｅｃｈｎｏｌｏｇｙ（日本原子力学会英文論文誌）

  Ｊｏｕｒｎａｌ　ｏｆ　Ｎｕｃｌｅａｒ　Ｓｃｉｅｎｃｅ　ａｎｄ　Ｔｅｃｈｎｏｌｏｇｙ（日本原子力学会英文論文誌） 30 (11), 1099-1106, 1993

  一般社団法人 日本原子力学会

キーワード

• neutron capture
• neutron reaction
• cesium 137
• cesium 138
• cross sections
• thermal neutrons
• resonance integral
• nucleor transmutation
• chemical separation
• gamma spectra
• activation method

詳細情報

• CRID: 1390282679070516608
• NII論文ID: 130000825764
• DOI: 10.3327/jnst.30.1099
• COI: 1:CAS:528:DyaK2cXmsVeqtg%3D%3D
• ISSN: 18811248
• ISSN: 00223131
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可