Production of Nuclear Isomers from Stable Nuclides with Bremsstrahlung

概要

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For the application of photoexcitation process to activation analysis, a fundamental experiment was carried out. A number of stable elements were irradiated with Bremsstrahlung from a 6 MeV linear electron accelerator. It was confirmed that the following isomers were directly produced from the stable nuclides with photons: Se-77m, Br-79m, Sr-87m, Y-89m, Rh-103m, Ir-191m, Pt-195m, Au-197m, and Hg-199m. Both In-113m and Ba-135m were not reliable and any isomers of even-even nuclides could not be observed in this experiment. In order to facilitate the measurement in practical use, especially for the isomers with half-life as short as several seconds, an automatic apparatus was designed and constructed. After a sample to be tested is transferred by an pneumatic conveyer to the irradiating position, the half-life and the transition energies can be automatically measured with an appreciable accuracy. Dentails of the apparatus are described. Half-lives of some short-lived isomers in question could be measured with the accuracy of 1-2% by using this apparatus with the overlap counting technique.
社団法人応用物理学会の論文
1963-07-15