Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of the 166mHo(n, γ167Ho Reaction using a Two-Step Irradiation Technique

The thermal neutron capture cross section (a0) and the resonance integral (I0) of 166mHo have been measured as data for the transmutation of nuclear waste. Samples of 166mHo were made by the neutron irradiation of 165Ho. Two metallic foils of 165Ho were irradiated for 2 weeks and two others for 3 weeks at the Kyoto University Reactor. A high purity Ge detector was employed for activity measurement. The samples irradiated were cooled for 3 months to reduce the activity of 166gHo. One of the samples irradiated for 2 weeks was irradiated again with Cd cover sheets and the other one without a Cd cover sheet. For the samples irradiated for 3 weeks, the same irradiation was performed. The 167Hon uclei were produced at the second irradiation via the neutron capture of 166mHo and the double neutron capture of 165Ho. The amount of 167Ho via the double capture was estimated from the difference between the data of 2 week irradiation and 3 week irradiation, and corrected. The reaction rate to produce 167Ho from 166mHo was analyzed by Westcott's convention. A resonance at 0.274 eV was considered in the analysis. The results obtained were 3.11±0.82kb for the a0 and 10.0±2.7 kb for the Ia of 166mHo.

[1]  K. Krane.  Thermal neutron capture cross sections of long-lived nuclei measured by activation , 2001 .

[2]  H. Harada,et al.  Measurement of Effective Neutron Capture Cross Section of 166mHo using Two Step Irradiation Technique , 2000 .

[3]  Katsutoshi Kobayashi,et al.  Measurement of Thermal Neutron Cross Section and Resonance Integral of the Reaction 135Cs(n, γ)136Cs , 1997, Journal of Nuclear Science and Technology.

[4]  H. Harada,et al.  Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of the129I(n, γ)130I Reaction , 1996 .

[5]  H. Harada,et al.  Measurement of Thermal Neutron Cross Section and Resonance Integral of the Reaction 99Tc(n, γ)100Tc , 1995 .

[6]  H. Harada,et al.  Measurement of Thermal Neutron Cross Section and Resonance Integral of the Reaction99Tc(n, γ)100Tc , 1995 .

[7]  Katsutoshi Kobayashi,et al.  Measurement of the Thermal Neutron Cross Section of the 90Sr(n, γ)91Sr Reaction , 1994 .

[8]  Katsutoshi Kobayashi,et al.  Measurement of the Thermal Neutron Cross Section of the90Sr(n, γ)91Sr Reaction , 1994 .

[9]  Katsutoshi Kobayashi,et al.  Measurement of Thermal Neutron Cross Section and Resonance Integral of the Reaction 137Cs(n, γ) 138Cs , 1993 .

[10]  V. A. Anufriev,et al.  Resonance parameters of165Ho and166mHo , 1992 .

[11]  Katsutoshi Kobayashi,et al.  Measurement of Thermal Neutron Cross Section of 137Cs(n, γ)138Cs Reaction , 1990 .

[12]  Katsutoshi Kobayashi,et al.  Measurement of Thermal Neutron Cross Section of137Cs(n, γ)138Cs Reaction , 1990 .

[13]  S. Mughabghab,et al.  INTRODUCTION TO NEUTRON PHYSICS OF THERMAL CROSS SECTIONS AND RESONANCE PARAMETERS , 1981 .

[14]  Richard B. Firestone,et al.  Table of Isotopes , 1978 .

[15]  T. B. Ryves,et al.  The resonance integrals of 63Cu, 65Cu, 107Ag, 159Tb, 164Dy and 165Ho , 1974 .

[16]  K. T. Faler.  Determination of the half-life of the longer-lived 166Ho isomer , 1965 .

[17]  R. W. Fink,et al.  ACTIVATION CROSS SECTIONS FOR 14.8-Mev NEUTRONS AND SOME NEW RADIOACTIVE NUCLIDES IN THE RARE EARTH REGION , 1960 .

[18]  W. H. Walker,et al.  EFFECTIVE CROSS SECTIONS AND CADMIUM RATIOS FOR THE NEUTRON SPECTRA OF THERMAL REACTORS , 1959 .

[19]  M. J. Poole.  Measurement of neutron spectra in moderators and reactor lattices—I Aqueous moderators , 1957 .

[20]  D. J. Hughes,et al.  Neutron cross section , 1955 .

[21]  V. Weisskopf,et al.  Theoretical Nuclear Physics , 1953 .