Abstract
In order to search for traces of the181Ta(α, π −)185Os reaction a foil stack of very pure tantalum was bombarded with anα-beam of 173 MeV. A radiochemical separation method was applied to four parts of the stack. So two sources corresponding to energies above and below the (α, π −) threshold were obtained and searched for contents of185Os. Using a well shielded Ge(Li) detector weak 646 keV transitions belonging to185Os were observed for all samples. Since the origin of this activity is uncertain for the samples below threshold only an upper limit of 100 nb can be set for the (α, π −) reaction on181Ta above threshold.
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The authors appreciate stimulating discussions with Prof. M.G. Huber. We thank Prof. C. Mayer-Böricke and the staff of the Institut für Kernphysik der Kernforschungsanlage Jülich for providing the high energyα-beam, Prof. H.W. Nürnberg and the Zentralinstitut für Analytische Chemie der Kernforschungsanlage Jülich for analysing the target material, and Prof. H.-W. Scharpenseel of the Institut für Bodenkunde der Universität Bonn for supplying the lowactivity lead shielding.
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Eggermann, J., Ernst, J., Mayer-Kuckuk, T. et al. An upper limit for the (α, π −) reaction on181Ta. Z Physik A 273, 381–384 (1975). https://doi.org/10.1007/BF01435580
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DOI: https://doi.org/10.1007/BF01435580