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2002 Fiscal Year Final Research Report Summary

Study on Fast-Neutron Capture Cross Sections of Long-Lived Nuclear Wastes

Research Project

Project/Area Number 12480137
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionTokyo Institute of Technology

Principal Investigator

IGASHIRA Masayuki  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Associate Professor, 原子炉工学研究所, 助教授 (10114852)

Co-Investigator(Kenkyū-buntansha) OHSAKI Toshiro  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Research Associate, 原子炉工学研究所, 助手 (80262327)
Project Period (FY) 2000 – 2002
KeywordsLong-Lived Nuclear Wastes / Fast・Neutron Reaction / Capture Cross Sections / Capture Gamma・Ray Spectra / Technetium・99 / Iodine-129
Research Abstract

The objectives of this project are to accurately and simultaneously measure the neutron capture cross sections and capture gamma-ray spectra of the very important long-lived nuclear wastes of Tc-99 and I-129 in the incident neutron energy region from 10 to 600 keV and to investigate the fast-neutron capture reaction mechanism by theoretically analyzing these measured data and those of 19 stable fission products and the long-lived minor actinide of Np-237 which were also obtained by our group. The following results were obtained in the term of this project.
(1)Measurements for Tc-99 and I-129
Prompt gamma rays from the neutron capture reaction of Tc-99 or I-129 were measured with a high-sensitive gamma-ray detector, adopting a neutron time-of-flight method with pulsed keV neutrons form the ^7Li(p,n)^7Be reaction by a 1.5-ns pulsed proton beam from the Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. As a result, the capture cross sections of Tc-99 and I-129 were obtained with the errors of about 5% and about 10%, respectively, in the incident neutron energy region from 10 to 600 keV. As for capture gamma-ray spectra, those of Tcb-99 and I-129 were obtained for the first time in the world.
(2)Theoretical analysis of experimental results
The measured capture cross sections and capture gamma-ray spectra of Tc-99 and I-129 together with those of the other nuclides were simultaneously analyzed, using a computer program based on the statistical model in the nuclear reaction theory. As a result, it was found that the statistical model calculation could reproduce both capture cross sections and capture gamma-ray spectra of Tc-99 and l-129 except for the high-energy part and the corresponding low-energy part in the gamma-ray spectra. Therefore, it was found that the main mechanism of the fast-neutron capture reaction of Tc-99 and I-129 could be explained with the statistical model.

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] A.K.M.Harun-Ar-Rashid: "Measurement of keV-Neutron Capture Cross Sections and Capture Cross Sections and Capture Gammna-Ray Spectra of ^<167>Er"J.Nuci.Sci.Technol.. 37. 421-427 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Harnood: "Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of ^<140>Ce and ^<141>Pr"J.Nucl.Sci.Technol.. 37. 740-749 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Matsumoto: "Measurement of keV-Neutron Capture Cross Sections of ^<99>Tc and ^<237>Np for the Transmutation Study"Proc.The 4-th Japan-Korea Seminar on Advanced Reactors. 208-213 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Kim: "Measurement of keV-neutron capture cross-sections for ^<164>Dy"Annals of Nuclear Energy. 28. 1549-1562 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Kim: "Capture Cross Section Measurements of ^<161>Dy and ^<162>Dy in the Energy Region Between 10 keV and 90 keV"J.Nucl.Sci.Technol.. Supplement2. 303-306 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Kim: "Neutron Capture Cross-Section Measurement for ^<163>Dy in the Neutron Energy Range from 15 to 75 keV"J.the Korean Physical Society. 41. 655-661 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Matsumoto: "Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of ^<99>Tc"J.Nucl.Sci.Technol.. 40. 61-68 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Igashira: "Recent Experimental Data"Proc.the 2002 Symposium on Nuclear Data. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Saito: "Measurement of Cross Sections of the ^<210>Po Production Reaction by keV-Neutron Capture of ^<209>Bi"Proc.the 2002 Symposium on Nuclear Data. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Igashira: "An Interpretation of the Anomalous Bump in keV-Neutron Capture γ-Ray Spectra of Lanthanide Nuclides"Proc.Int.Symp.on Capture Gamma-Ray Spectra and Related Topics. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Matsumoto: "Measurement of keV-Neutron Capture Cross Sections of I-129"Proc.Int.Symp.on Capture Gamma-Ray Spectra and Related Topics. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Saito: "Measurement of keV-Neutron Capture Cross Sections of ^<209>Bi"Proc.Int.Symp.on Capture Gamma-Ray Spectra and Related Topics. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.K.M. Heron-Ar-Rashid,: "Measurement of keV-Neutron Capture Gross Sections and Capture Gamma-Ray Spectra of ^<167>Er"J. Nucl. Sci. Technol.. 37. 421-427 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Harnood: "Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of ^<140>Ce and ^<141>Pr"J. Nucl. Sci. Technol.. 37. 740-749 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Matsumoto: "Measurement of keV-Neutron Capture Cross Sections of ^<99>Tc and ^<237>Np for the Transmutation Study"Proc. The 4^<th> Japan-Korea Seminar on Advanced Reactors. 208-213 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G. Kim: "Measurement of keV-neutron capture cross-sections for ^<164>Dy"Annals of Nuclear Energy. 28. 1549-1562 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G. Kim: "Capture Cross Section Measurements of ^<161>Dy and ^<162>Dy in the Energy Region Between 10keV and 90 keV"J. Nucl. Sci. Technol. Supplement 2. 303-306 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kim: "Neutron Capture Cross-Section Measurement for ^<163>Dy in the Neutron Energy Range from 15 to 75 keV"J. the Korean Physical Society. 41. 655-661 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Matsumoto: "Measurement of keV-Neutron Capture Cross Sections and Gamma-Ray Spectra of ^<99>Tc"J. Nucl. Sci. Technol.. 40. 61-68 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Igashira and K. Ohgama: "Recent Experimental Data"Proc. The 2002 Symposium on Nuclear Data. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Saito: "Measurement of Cross Sections of the ^<210>Po Production Reaction by keV-Neutron Capture of ^<209>Bi"Proc. The 2002 Symposium on Nuclear Data. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Igashira: "An Interpretation of the Anomalous Bump in keV-Neutron Capture γ-Ray Spectra of Lanthanide Nuclides"Proc. The 11^<th> Int. Symposium on Capture Gamma-Ray Spectroscopy and Related Topics. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Matsumoto: "Measurement of keV-Neutron Capture Cross Sections of I-129"Proc. The 11^<th> Int. Symposium on Capture Gamma-Ray Spectroscopy and Related Topics. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Saito: "Measurement of keV-Neutron Capture Cross Section ^<209>Bi"Proc. The 11^<th> Symposium on Capture Gamma-Ray Spectroscopy and Related Topics. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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