Formation cross sections of zirconium-90m and lead-207m with fast neutrons.
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概要
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The cross sections for the formation of the metastable states of <SUP>90</SUP>Zr, (σ<SUB>Zr</SUB>), for neutron energy of 14.8 MeV, and that of <SUP>207</SUP>Pb, (σ<SUB>Pb</SUB>), for neutron energies from 4.1 to 5.2 MeV have been measured and the results are reported. The experimentally deter-mined value of the cross section for the former is 700±94 mb, while for the latter, the cross section increases from 316±44 mb to 788±110 mb. The cross section ratio, σ<SUB>Pb</SUB>/σ<SUB>Zr</SUB>, is also studied, which is found to vary from 1.87 to 2.18 for neutron energies from 14.8 to 18.2 MeV respectively.<BR>The equality in the half-lives of the metastable states of <SUP>90</SUP>Zr and <SUP>207</SUP>Pb is exploited in the present measurements, which enabled comparative evaluation of the cross sections. <BR>Natural samples of zirconium and lead were irradiated simultaneously and the γ-rays were measured off-line by a 55 cm<SUP>3</SUP> Ge(Li) detector. Cyclic activation process was adopted to improve the counting statistics. The overall accuracy achieved in the measurements is about 10%.
- 一般社団法人 日本原子力学会の論文
著者
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Katoh Toshio
Department Of Nuclear Engineering Faculty Of Engineering Nagoya University
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Amemiya Susumu
Department Of Nuclear Engineering Nagoya University
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Matsui Takayuki
Department Of Biological Science And Technology Faculty Of Engineering The University Of Tokushima
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BHORASKAR Vasant
Department of Nuclear Engineering, Nagoya University
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KATOH Kikuichi
Department of Nuclear Engineering, Nagoya University
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