Uranium fluoride and metallic uranium as target materials for heavy-element experiments at SHIP

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• 作者：Birgit Kindler ; Dieter Ackermann ; Willi Hartmann ; Fritz Peter Heß ; berger ; Sigurd Hofmann ; Annett Hü ; bner ; Bettina Lommel ; Rido Mann ; Jutta Steiner
• 关键词：Heavy-element synthesis ; Magnetron sputtering ; Thermal evaporation
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2008
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：1 June 2008
• 卷：590
• 期：1-3
• 页码：126-130
• 文件大小：1248 K

摘要

In this contribution we describe the production and application of uranium targets for synthesis of heavy elements. The targets are prepared from uranium fluoride (UF₄) and from metallic uranium with thin carbon foils as backing. Targets of UF₄ were produced by thermal evaporation in a similar way as the frequently applied targets out of Bi, Bi₂O₃, Pb, PbS, SmF₃, and NdF_3, prepared mostly from isotopically enriched material [Birgit Kindler, et al., Nucl. Instr. and Meth. A 561 (2006) 107; Bettina Lommel, et al., Nucl. Instr. and Meth. A 561 (2006) 100]. In order to use more intensive beams and to avoid scattering of the reaction products in the target, metallic uranium is favorable. However, evaporation of metallic uranium is not feasible at a sustainable yield. Therefore, we established magnetron sputtering of metallic uranium. We describe production and properties of these targets. First irradiation tests show promising results.