Production of Nuclear Isomers from Stable Nuclides with Bremsstrahlung

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Abstract
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, Ag-107m+Ag-109m, Cd-111m, In-115m, Sn-117m, Ba-137m, Hf-179, W-183m, Ir-191m, Pt-195m, Au-197, 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. Details 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.

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