Comparative Yields of Fe54(γ, pn)Mn52 and Fe54(γ, 2n)Fe52
نویسندگان
چکیده
The relative rates of formation of four photonuclear reactions produced by 70 Mev X-ray irradiations of iron metal were measured. The reactions investigated were the Fe54( γ,pn)Mn52m, Fe54(γ,pn)Mn52, Fe54(γ,2n)Fe52 and Fe57(γ,p)Mn56. The manganese yields were determined by measuring the radioactive manganese chemically separated from the target material. It was found that the total (γ,pn) yield was about 19 times greater than the (γ,2n) yield. This result is explained in terms of the lmver threshold energy of the (γ,pn) reaction, and the energy distribution of the gamma-ray spectrum. The ratio of the formation cross sections for Mn52 and Mn52m indicated a higher probability for the formation of the metastable state by a factor of about two.
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